msm: camera: isp: Fix overwriting UBWC config register
UBWC mode config register is first read to ensure that
it is not overwritten while setting the UBWC_EN bit
to enable UBWC for bus write master.
Change-Id: Id1600429fe7958a333988ca706013f5e651d4393
Signed-off-by:
Venkat Chinta <vchinta@codeaurora.org>
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