rpi-base.inc: Add rpi-backlight.dtbo

Add rpi-backlight.dtbo to RPI_KERNEL_DEVICETREE_OVERLAYS. This is
a devicetree overlay for mailbox-driven Raspberry Pi DSI Display
backlight controller.

This work was sponsored by GOVCERT.LU.

Signed-off-by: Leon Anavi <[email protected]>

Author: leon-anavi

conf/machine/include/rpi-base.inc

@@ -76,6 +76,7 @@ RPI_KERNEL_DEVICETREE_OVERLAYS ?= " \
     overlays/vc4-kms-v3d-pi5.dtbo \
     overlays/vc4-kms-dsi-7inch.dtbo \
     overlays/vc4-kms-dsi-ili9881-7inch.dtbo \
+    overlays/rpi-backlight.dtbo \
     overlays/w1-gpio.dtbo \
     overlays/w1-gpio-pullup.dtbo \
     overlays/w1-gpio-pi5.dtbo \