add pwm mode option #1241

Job	Run time
call-node-workflow / build	43s
build (Pico)	3m 25s
build (AlpacaOwO)	2m 47s
build (BentoBox)	3m 15s
build (DURAL)	2m 47s
build (FightboardV3)	4m 56s
build (FightboardV3Mirrored)	3m 45s
build (FlatboxRev4)	2m 46s
build (FlatboxRev5)	3m 32s
build (FlatboxRev5RGB)	3m 6s
build (KB2040)	3m 19s
build (KeyboardConverter)	3m 20s
build (MavercadeKeebfighter)	2m 50s
build (PicoAnn)	3m 35s
build (PicoFightingBoard)	2m 43s
build (ReflexEncoder)	3m 24s
build (RP2040AdvancedBreakoutBoard)	3m 37s
build (RP2040MiniBreakoutBoard)	2m 46s
build (SparkFunProMicro)	3m 42s
build (WaveshareZero)	3m 40s
build (Stress)	3m 20s
build (SGFDevices)	3m 22s
	1h 10m 40s

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