as3722: Add "set_reg" function.

Some boards may want to access As3722 registers and do some special settings.
Extending As3722 with "set_reg" function to provide non-standard-power
functions.

BUG=chrome-os-partner:27035
TEST=emerge-nyan depthcharge # pass and boots
BRANCH=nyan

Change-Id: I885432a4083fe53d6a7f27da8fcf13f6eb09aeac
Signed-off-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/196959
Reviewed-by: Gabe Black <gabeblack@chromium.org>
Tested-by: Andrew Bresticker <abrestic@chromium.org>
2 files changed