arch/arm/boot/dts/overlays : Add Waveshare 7-DSI-TOUCH-C screen support #4265

Job	Run time
build (arm64, arm64, defconfig, kernel8)	18m 45s
build (bcmrpi, arm, bcmrpi_defconfig, kernel)	17m 40s
build (bcm2709, arm, bcm2709_defconfig, kernel7)	19m 42s
build (bcm2711, arm64, bcm2711_defconfig, kernel8)	21m 54s
build (bcm2835, arm, bcm2835_defconfig, kernel)	7m 44s
build (bcm2711_rt, arm64, bcm2711_rt_defconfig, kernel8_rt)	22m 59s
build (bcm2712, arm64, bcm2712_defconfig, kernel_2712)	22m 32s
	2h 11m 16s

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