msm_11ad: add VDD and VDDIO regulators voting

On platforms where the power supply for 11AD is external
the wil6210 driver has to vote for the VDD and VDDIO regulators.

This patch adds such voting and guarantees the required
voltage for each regulator.

Change-Id: I472fe6b0600557bc4e623a3dd1b6352fd4a86e27
Signed-off-by: Maya Erez <merez@codeaurora.org>