samples: display: Enhance lvgl sample to support touch input

Enhances the lvgl sample to support an optional touch panel input on
mimxrt10{50,60,64}_evk boards.

Signed-off-by: Maureen Helm <maureen.helm@nxp.com>

samples/display/lvgl/README.rst

@@ -7,7 +7,10 @@ Overview
 ********
 
 This sample application displays "Hello World" in the center of the screen
-and a counter at the bottom which increments every second.
+and a counter at the bottom which increments every second. If an input driver
+is supported, such as the touch panel controller on mimxrt10{50,60,64}_evk
+boards, "Hello World" is enclosed in a button that changes to the toggled state
+when touched.
 
 Requirements
 ************

samples/display/lvgl/prj.conf

@@ -7,3 +7,5 @@ CONFIG_LOG=y
 
 CONFIG_LVGL=y
 CONFIG_LVGL_OBJ_LABEL=y
+CONFIG_LVGL_OBJ_CONTAINER=y
+CONFIG_LVGL_OBJ_BUTTON=y

samples/display/lvgl/src/main.c

@@ -30,7 +30,17 @@ void main(void)
 		return;
 	}
 
-	hello_world_label = lv_label_create(lv_scr_act(), NULL);
+	if (IS_ENABLED(CONFIG_LVGL_POINTER_KSCAN)) {
+		lv_obj_t *hello_world_button;
+
+		hello_world_button = lv_btn_create(lv_scr_act(), NULL);
+		lv_obj_align(hello_world_button, NULL, LV_ALIGN_CENTER, 0, 0);
+		lv_btn_set_fit(hello_world_button, LV_FIT_TIGHT);
+		hello_world_label = lv_label_create(hello_world_button, NULL);
+	} else {
+		hello_world_label = lv_label_create(lv_scr_act(), NULL);
+	}
+
 	lv_label_set_text(hello_world_label, "Hello world!");
 	lv_obj_align(hello_world_label, NULL, LV_ALIGN_CENTER, 0, 0);