soc: qcom: pil-q6v5: Optionally vote for the pnoc clock

Some chipsets require PIL to vote for the PNOC
bus in order to allow the modem to access hardware
very early in its boot sequence.

Change-Id: I09dca9ba81dc8857b1fc7016fca435886040eb7e
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>