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Draft: fb-dev-leds: support hw_pattern for Qualcomm LPG

Qualcomm LPG LED drivers support HW patterns which are specific for the hardware. Add support for them so we can offload the LED pattern generation to the hardware. This way, the main CPU can suspend while the LED pattern still works.

The LPG LED driver hw_pattern discussion was resolved and a patch was merged in Linux 5.19-rc1:

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