misc: ws2812-pio-rp1: Add pass-through mode #4200

Job	Run time
build (bcm2711, arm64, bcm2711_defconfig, kernel8)	24m 43s
build (bcm2835, arm, bcm2835_defconfig, kernel)	6m 31s
build (bcm2711_rt, arm64, bcm2711_rt_defconfig, kernel8_rt)	25m 6s
build (arm64, arm64, defconfig, kernel8)	23m 39s
build (bcm2712, arm64, bcm2712_defconfig, kernel_2712)	25m 56s
build (bcm2709, arm, bcm2709_defconfig, kernel7)	20m 5s
build (bcmrpi, arm, bcmrpi_defconfig, kernel)	19m 37s
	2h 25m 37s

Provide feedback