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Add a mailbox-driven backlight controller for the Raspberry Pi DSI touchscreen display. Requires updated GPU firmware to recognise the mailbox request. Signed-off-by: Gordon Hollingworth <gordon@raspberrypi.org> Add Raspberry Pi firmware driver to the dependencies of backlight driver Otherwise the backlight driver fails to build if the firmware loading driver is not in the kernel Signed-off-by: Alex Riesen <alexander.riesen@cetitec.com>