msm: vidc: Avoid calling scale clocks from controls

V4L2 control framework acquires ctrls lock before
s_ctrl and g_ctrl. If driver calls scale clocks with
control, it internally calls g_ctrl and it leads to
deadlocks. Hence avoid calling scale clocks with control.
The clocks will be scaled with future ETB\FTB anyways.

Change-Id: I8bf62d18fca445b0c1239b15e510790cf2105a8e
Signed-off-by: Praneeth Paladugu <ppaladug@codeaurora.org>