msm: ipa: fix clock vote sm on imp

Fix the state machine state check for IPA MHI Proxy
when vote request arrives.

Change-Id: I0f56ae9705b47c4ff9f5e84f752e057e903bf9df
CRs-Fixed: 2247846
Acked-by: Ady Abraham <adya@qti.qualcomm.com>
Signed-off-by: Skylar Chang <chiaweic@codeaurora.org>