Loc moved to prev consolidation change (#12427)

Why I did it
Issue was caused by this #11341

*.bin image structure in 202205:

vkarri@19d5638dde2d:/sonic$ ls -l /tmp/tmp.9ibWSipeRw/installer/x86_64/
total 12
drwxr-xr-x 2 vkarri dip 12288 Oct 14 13:16 platforms
However install.sh which runs on ONiE parition expects the platform specific kernel cmd line conf file under platform/$onie_platform_string file https://github.com/sonic-net/sonic-buildimage/blob/master/installer/install.sh#L102

Thus, any platform which defines and depends on these params might be broken on master label.

How I did it
Since we are already filtering the conf files based on TARGET_PLATFORM in build_image.sh, i've just updated the location to installer/platforms instead of installer/$arch/platforms

Signed-off-by: Vivek Reddy Karri <vkarri@nvidia.com>

build_image.sh

@@ -71,12 +71,12 @@ generate_onie_installer_image()
     output_file=$OUTPUT_ONIE_IMAGE
     [ -n "$1" ] && output_file=$1
     # Copy platform-specific ONIE installer config files where onie-mk-demo.sh expects them
-    rm -rf ./installer/${TARGET_PLATFORM}/platforms/
-    mkdir -p ./installer/${TARGET_PLATFORM}/platforms/
+    rm -rf ./installer/platforms/
+    mkdir -p ./installer/platforms/
     for VENDOR in `ls ./device`; do
         for PLATFORM in `ls ./device/$VENDOR | grep ^${TARGET_PLATFORM}`; do
             if [ -f ./device/$VENDOR/$PLATFORM/installer.conf ]; then
-                cp ./device/$VENDOR/$PLATFORM/installer.conf ./installer/${TARGET_PLATFORM}/platforms/$PLATFORM
+                cp ./device/$VENDOR/$PLATFORM/installer.conf ./installer/platforms/$PLATFORM
             fi
 
         done