Moved contents of rgblight_reconfig.h to rgblight_post_config.h.

In qmk#3582, rgblight_reconfig.h had to be newly created. Now, the build system of qmk_firmware has a post_cofig feature, so that what was done in rgblight_reconfig.h can now be realized in rgblight_post_config.h.

**This commit does not change the build result.**

Testing script
```shell
  # build on master
  git checkout master
  echo master > /tmp/master_md5.txt

  # RGBLIGHT_ENABLE = no
  make HELIX=verbose helix/rev2:default:clean
  make HELIX=verbose helix/rev2:default
  md5 helix_rev2_default.hex >> /tmp/master_md5.txt

  # RGBLIGHT_ENABLE = yes, with animations
  make HELIX=verbose helix/rev2/back:default:clean
  make HELIX=verbose helix/rev2/back:default
  md5 helix_rev2_back_default.hex >> /tmp/master_md5.txt

  # RGBLIGHT_ENABLE = yes, without animations
  make HELIX=verbose,no_ani helix/rev2/back:default:clean
  make HELIX=verbose,no_ani helix/rev2/back:default
  md5 helix_rev2_back_default.hex >> /tmp/master_md5.txt

  # build on refactor_rgblight_reconfig.h
  git checkout refactor_rgblight_reconfig.h
  echo refactor_rgblight_reconfig.h > /tmp/branch_md5.txt

  # RGBLIGHT_ENABLE = no
  make HELIX=verbose helix/rev2:default:clean
  make HELIX=verbose helix/rev2:default
  md5 helix_rev2_default.hex >> /tmp/branch_md5.txt

  # RGBLIGHT_ENABLE = yes, with animations
  make HELIX=verbose helix/rev2/back:default:clean
  make HELIX=verbose helix/rev2/back:default
  md5 helix_rev2_back_default.hex >> /tmp/branch_md5.txt

  # RGBLIGHT_ENABLE = yes, without animations
  make HELIX=verbose,no_ani helix/rev2/back:default:clean
  make HELIX=verbose,no_ani helix/rev2/back:default
  md5 helix_rev2_back_default.hex >> /tmp/branch_md5.txt

  diff -u /tmp/master_md5.txt /tmp/branch_md5.txt
```

Test result:
```
--- /tmp/master_md5.txt 2020-01-03 15:42:22.000000000 +0900
+++ /tmp/branch_md5.txt 2020-01-03 15:42:42.000000000 +0900
@@ -1,4 +1,4 @@
-master
+refactor_rgblight_reconfig.h
 MD5 (helix_rev2_default.hex) = f360032edd522448366d471d8f4f8181
 MD5 (helix_rev2_back_default.hex) = 0c663acc6cccc44476b3b969ad22a48f
 MD5 (helix_rev2_back_default.hex) = e66b1195ff6d38e6e22c975b8ae42fd3
```

quantum/rgblight.h

@@ -16,8 +16,6 @@
 #ifndef RGBLIGHT_H
 #define RGBLIGHT_H
 
-#include "rgblight_reconfig.h"
-
 /***** rgblight_mode(mode)/rgblight_mode_noeeprom(mode) ****
 
  old mode number (before 0.6.117) to new mode name table

quantum/rgblight_post_config.h

@@ -3,3 +3,28 @@
 // it is considered that RGBLIGHT_SPLIT is defined implicitly.
 #    define RGBLIGHT_SPLIT
 #endif
+
+#ifdef RGBLIGHT_ANIMATIONS
+// for backward compatibility
+#    define RGBLIGHT_EFFECT_BREATHING
+#    define RGBLIGHT_EFFECT_RAINBOW_MOOD
+#    define RGBLIGHT_EFFECT_RAINBOW_SWIRL
+#    define RGBLIGHT_EFFECT_SNAKE
+#    define RGBLIGHT_EFFECT_KNIGHT
+#    define RGBLIGHT_EFFECT_CHRISTMAS
+#    define RGBLIGHT_EFFECT_STATIC_GRADIENT
+#    define RGBLIGHT_EFFECT_RGB_TEST
+#    define RGBLIGHT_EFFECT_ALTERNATING
+#endif
+
+#ifdef RGBLIGHT_STATIC_PATTERNS
+#    define RGBLIGHT_EFFECT_STATIC_GRADIENT
+#endif
+
+// check dynamic animation effects chose ?
+#if defined(RGBLIGHT_EFFECT_BREATHING) || defined(RGBLIGHT_EFFECT_RAINBOW_MOOD) || defined(RGBLIGHT_EFFECT_RAINBOW_SWIRL) || defined(RGBLIGHT_EFFECT_SNAKE) || defined(RGBLIGHT_EFFECT_KNIGHT) || defined(RGBLIGHT_EFFECT_CHRISTMAS) || defined(RGBLIGHT_EFFECT_RGB_TEST) || defined(RGBLIGHT_EFFECT_ALTERNATING)
+#    define RGBLIGHT_USE_TIMER
+#    ifndef RGBLIGHT_ANIMATIONS
+#        define RGBLIGHT_ANIMATIONS  // for backward compatibility
+#    endif
+#endif

tmk_core/common/avr/suspend.c

@@ -9,7 +9,6 @@
 #include "timer.h"
 #include "led.h"
 #include "host.h"
-#include "rgblight_reconfig.h"
 
 #ifdef PROTOCOL_LUFA
 #    include "lufa.h"

tmk_core/protocol/chibios/main.c

@@ -32,7 +32,6 @@
 #include "sendchar.h"
 #include "debug.h"
 #include "printf.h"
-#include "rgblight_reconfig.h"
 
 #if (defined(RGB_MIDI) || defined(RGBLIGHT_ANIMATIONS)) && defined(RGBLIGHT_ENABLE)
 #    include "rgblight.h"

tmk_core/protocol/lufa/lufa.c

@@ -54,7 +54,6 @@
 #include "quantum.h"
 #include <util/atomic.h>
 #include "outputselect.h"
-#include "rgblight_reconfig.h"
 
 #ifdef NKRO_ENABLE
 #    include "keycode_config.h"

tmk_core/protocol/vusb/main.c

@@ -20,7 +20,6 @@
 #include "timer.h"
 #include "uart.h"
 #include "debug.h"
-#include "rgblight_reconfig.h"
 
 #if (defined(RGB_MIDI) || defined(RGBLIGHT_ANIMATIONS)) && defined(RGBLIGHT_ENABLE)
 #    include "rgblight.h"