msm: ipa: enable IPA clock during SSR and power collapse

During SSR and power collapse, the IPA clock is disabled,
and writing to registers during the SSR cleanup/initialization
is crashing the target.
This fix enables the IPA clock before writing to registers
during SSR.

CRs-fixed: 717676
Change-Id: Ibd502d71432f699aaabed3859f438cd9f446ec32
Signed-off-by: Sivan Reinstein <sivanr@codeaurora.org>