msm: camera: flash: Add support for qup i2c flash

Add Support for qup i2c based flash. Update i2c
driver probe function and added regulator init at
power up and init for gpio pin control table. Since
positive return values are not errors for qup i2c rx
and tx data transfer, fix the return type for the APIs.
Added check for null pointer in get flash dt data for
device node. Correct the logging group in sensor util
for regulator power up function.

CRs-Fixed: 3047031
Change-Id: I70558fbb489b622da25278283015139b6d4fe2a6
Signed-off-by: Vishal Verma <vishverm@codeaurora.org>