lvgl: add new migration guide entry

This patch can cause breaking change, so it need migration guide entry.

Signed-off-by: Quentin LACOMBE <[email protected]>

Author: Quentlac

doc/releases/migration-guide-4.3.rst

@@ -271,5 +271,14 @@ Silabs
 * The separate ``em3`` power state was removed from Series 2 SoCs. The system automatically
   transitions to EM2 or EM3 depending on hardware peripheral requests for the oscillators.
 
+LVGL
+====
+
+* The PIXEL_FORMAT_MONO10 and PIXEL_FORMAT_MONO01 formats were swapped
+  in :zephyr_file:`modules/lvgl/lvgl_display_mono.c`, which caused
+  black and white to be inverted when using LVGL with monochrome displays.
+  This issue has now been fixed. Any workarounds previously applied to achieve the expected
+  behavior should be removed, otherwise black and white will be inverted again.
+
 Architectures
 *************