soc: qcom: pil: Proxy vote for QPIC clock during modem boot

On MDM targets, QPIC clock need to be enabled during modem boot.
On cold boot, RPM sets the proxy vote for modem. But during a SSR,
HLOS needs to proxy vote. Put in a proxy vote from HLOS PIL which
is removed once the modem boots up.

Change-Id: I02d5ad5c68e922683d53f38070df672200c0d933
Signed-off-by: Arun KS <arunks@codeaurora.org>
Signed-off-by: Lijuan Gao <lijuang@codeaurora.org>