GitLab

The current code doesn't enable regulators by calling
regulator_enable() which results in the issue that
regulator_set_voltage() calls are ignored. Fix this
by enabling regulators.

CRs-Fixed: 417008
Change-Id: I36954fb80c2b8bc24af9fc4b26876b20dce70157
Signed-off-by: Tianyi Gou <tgou@codeaurora.org>