msm: ipa: fix issue of writing to register after clock devote

Make sure IPA clock is voted before writing to a register.

Change-Id: I59bacb4d2efcfb2c76017bbe40a8d70e5dfb2000
Acked-by: Michal Amsterdam <mamsterd@qti.qualcomm.com>
Signed-off-by: Amir Levy <alevy@codeaurora.org>