msm: vidc: ensure venus is in power on before scaling clocks

It is to be ensured that venus is in power on state before scaling
clocks. When venus goes to power collapse, a resume can happen
either when driver writes some command to the command queue or any
response comes from firmware. So when client requests a particular
perf_level, venus is not resumed and scale clocks is called.

CRs-Fixed: 1000809

Change-Id: I2ac46c481065ada2b62a5eb248fbdf18f2b1a91f
Signed-off-by: Abdulla Anam <abdullahanam@codeaurora.org>