Revert "feat(conf) automatically enable LV_LVGL_H_INCLUDE_SIMPLE if lvgl.h can be included"

This reverts commit a995695cdf.

__has_include("lvgl.h") is always true beacsue it's next to lv_conf_internal.h.

scripts/lv_conf_checker.py

@@ -42,11 +42,6 @@ fout.write(
 #    define LV_CONF_INCLUDE_SIMPLE
 #   endif
 #  endif
-#  if __has_include("lvgl.h")
-#   ifndef LV_LVGL_H_INCLUDE_SIMPLE
-#    define LV_LVGL_H_INCLUDE_SIMPLE
-#   endif
-#  endif
 #endif
 
 /*If lv_conf.h is not skipped include it*/