msm: camera: ope: Maintain current clock value during acquire

OPE driver maintain the current clock value field per instance
based on clock rate set for OPE clock. OPE driver sets the clock
to turbo during acquire time but doesn't update the internal field
for multiple acquire request. This causes power regression as further
clock calculation happens on previously set clock values for multiple
acquire request.

Corrected the logic to always update current clock value based on clock
rate set during acquire time.

CRs-Fixed: 2724827
Change-Id: Iba377d8918bda37b4d3267e677414a7b9e5a82ce
Signed-off-by: Alok Chauhan <alokc@codeaurora.org>