configs: stm32f746-disco: limit resolution to 480x272

The patch fixes the y-resolution, which was causing the creation of a
framebuffer larger than actually needed, resulting in memory waste.

Fixes: cc1b0e7b8e55b ("board: Add display to STM32F746 SoC discovery board")
Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
diff --git a/configs/stm32f746-disco_defconfig b/configs/stm32f746-disco_defconfig
index 1fb30d8..057cb7e 100644
--- a/configs/stm32f746-disco_defconfig
+++ b/configs/stm32f746-disco_defconfig
@@ -59,7 +59,7 @@
 CONFIG_BACKLIGHT_GPIO=y
 CONFIG_VIDEO_STM32=y
 CONFIG_VIDEO_STM32_MAX_XRES=480
-CONFIG_VIDEO_STM32_MAX_YRES=640
+CONFIG_VIDEO_STM32_MAX_YRES=272
 CONFIG_SPLASH_SCREEN=y
 CONFIG_SPLASH_SCREEN_ALIGN=y
 CONFIG_VIDEO_BMP_RLE8=y
diff --git a/configs/stm32f746-disco_spl_defconfig b/configs/stm32f746-disco_spl_defconfig
index 25ea254..0534d62 100644
--- a/configs/stm32f746-disco_spl_defconfig
+++ b/configs/stm32f746-disco_spl_defconfig
@@ -85,7 +85,7 @@
 CONFIG_BACKLIGHT_GPIO=y
 CONFIG_VIDEO_STM32=y
 CONFIG_VIDEO_STM32_MAX_XRES=480
-CONFIG_VIDEO_STM32_MAX_YRES=640
+CONFIG_VIDEO_STM32_MAX_YRES=272
 CONFIG_SPLASH_SCREEN=y
 CONFIG_SPLASH_SCREEN_ALIGN=y
 CONFIG_VIDEO_BMP_RLE8=y