Fixes for omap against v4.3-rc5:

- Regulator fix for beagle-x15 to fix HDMI without a SD card being
  inserted

- GPMC fix for showing proper timings and to allow enabling debug
  options that somehow was unselectable earlier

- Add minimal documentation for new MMC1 dependency on
  REGULATOR_PBIAS as it may not be obvious for people with
  targeted .config files
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