Display driver fixups #4771

Job	Run time
build (bcm2712, arm64, bcm2712_defconfig, kernel_2712)	25m 53s
build (arm64, arm64, defconfig, kernel8)	23m 50s
build (bcm2709, arm, bcm2709_defconfig, kernel7)	19m 55s
build (bcm2711, arm64, bcm2711_defconfig, kernel8)	27m 40s
build (bcm2835, arm, bcm2835_defconfig, kernel)	7m 2s
build (bcm2711_rt, arm64, bcm2711_rt_defconfig, kernel8_rt)	26m 53s
build (bcmrpi, arm, bcmrpi_defconfig, kernel)	20m 52s
	2h 32m 5s

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