soc: spcom: unvote for sp regulators

Some power regulators are voted by SPSS UEFI driver,
that needs to be unvote by HLOS.

Change-Id: I6d9f24c3937188b316d5912751c48207f3b8ab85
Signed-off-by: Amir Samuelov <amirs@codeaurora.org>