misc: ws2812-pio-rp1: Add pass-through mode #4201

Job	Run time
build (bcm2711_rt, arm64, bcm2711_rt_defconfig, kernel8_rt)	25m 27s
build (bcm2712, arm64, bcm2712_defconfig, kernel_2712)	27m 38s
build (bcm2709, arm, bcm2709_defconfig, kernel7)	21m 23s
build (bcm2711, arm64, bcm2711_defconfig, kernel8)	24m 55s
build (bcm2835, arm, bcm2835_defconfig, kernel)	8m 19s
build (bcmrpi, arm, bcmrpi_defconfig, kernel)	20m 22s
build (arm64, arm64, defconfig, kernel8)	23m 47s
	2h 31m 51s

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