msm: ipa: avoid wakelock acquire/release during data

Hold IPA wakelock as long as IPA driver voted for IPA clocks
as part of suspend interrupt to avoid frequent acquire/release
of this resource.

Change-Id: I2fb4cbb201692023c328a7598a7f4e4ade541b3e
CRs-Fixed: 2133719
Acked-by: Ady Abraham <adya@qti.qualcomm.com>
Signed-off-by: Skylar Chang <chiaweic@codeaurora.org>