CHROMIUM: config: Enable FAN53555 regulator driver

Enable the regulator driver for the FAN53555, which is used to power
VDD_APC on Mistral.

BUG=b:124524751
TEST=Stepped through each frequency and observed voltage change

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Change-Id: I456b7f6dd8aff58237eee74f997f967dbfe0dfa5
Reviewed-on: https://chromium-review.googlesource.com/c/1481924
Reviewed-by: Zhihong Yu <zhihongyu@chromium.org>
Commit-Queue: Zhihong Yu <zhihongyu@chromium.org>
Tested-by: Zhihong Yu <zhihongyu@chromium.org>
1 file changed