power supply and reset changes for the v3.20 series

 * new drivers
  - charger driver for Maxim 77693
  - battery gauge driver for LTC 2941/2943
  - battery gauge driver for RT5033
  - reset driver for R-Mobile platforms
 * convert drivers to restart handler framework
  - arm-versatile
  - at91
  - st-poweroff
 * remove deprecated sun6i reboot driver
 * use alarmtimer instead of rtc in charger-manager
 * misc. fixes
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