msm: pil-q6v3: Move to common proxy voting

Remove the boiler plate workqueue and proxy voting code and move
to the common proxy infrastructure that the core pil code
provides. This has the added benefit of fixing any issues where
suspend happens before the proxy vote is removed.

Change-Id: I15c478a9306f82d3e286bf1be6e9e81455c4843e
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>