soc: qcom: pil-msa: Add support to disable vote for mss ahb clock

On some targets, it is not necessary to keep the vote for the mss ahb clock
while the modem is active. Add support so that we can remove the vote once
the modem has booted up.

Change-Id: Iba8abfdc874e4be53ac1b742f657c57ca04183b1
Signed-off-by: Pushkar Joshi <pushkarj@codeaurora.org>