Draft: sysctl-fw: add automatic powersave mode when on battery power and som is off

minuterequested to merge
powersave into main
  • sysctl-fw: add automatic powersave mode on battery+som off;
  • get current measurements from max monitor chip
  • make sure startup is always fast (by replacing sleep_us()s which can cause everything to hang for unknown reasons)
  • TODO: currently loses first UART command after sleep->wakeup. add command retry in keyboard fw
  • adds spi response checksums for lpc api v3
Edited by minute

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