msm: vidc: Remove redundant acquire_regulators call during suspend

The regulators whose control has been handed over to hardware, will
be acquired by driver as part of disable_regulator() call prior to
disabling the regulators. So we can remove the redundant call to
acquire_regulators during suspend call.

Change-Id: I90c2bbf399baa333d318f1ae15f7c7c8261e28ec
Signed-off-by: Arun Menon <avmenon@codeaurora.org>