soc: qcom: pil: Proxy vote for the QDSS clocks during modem boot

During modem boot, PBL might need to access the STM hardware
registers and thus needs the QDSS clock to be enabled at that
time. Put in a proxy vote from HLOS PIL which is removed once
the modem boots up.

Change-Id: I3d47a54b96a6ebe781a8786901423f304876a170
Signed-off-by: Deepak Katragadda <dkatraga@codeaurora.org>