msm: pil-q6v5-mss: Remove Q6 proxy votes on modem boot failure

If the modem fails to boot, there will be no proxy unvote
interrupt. Remove the proxy votes for the q6 immediately
if there is such a failure.

Change-Id: Ib1c510e952094ebdad42216137a8722c68b82774
Signed-off-by: Seemanta Dutta <seemanta@codeaurora.org>