board: rpi4: Rotate display in bootloader

Author: mattiaswal

src/board/raspberry-pi-4/config.txt

@@ -13,9 +13,9 @@ device_tree=bcm2711-rpi-4-b.dtb
 dtoverlay=rpi-env
 dtoverlay=infix-key
 dtoverlay=vc4-kms-v3d-pi4
-dtoverlay=vc4-kms-dsi-7inch
-
-#ignore_lcd=0
+dtoverlay=vc4-kms-dsi-7inch,rotation=180
+#dtoverlay=vc4-kms-dsi-7inch
+#lcd_rotate=2
 
 # To use an external initramfs file
 #initramfs rootfs.cpio.gz