msm: camera: sensor: handling condition for random read

Get i2c setting count twice in different location for i2c setting,
may lead to out of bound for reg settings. Record i2c setting count
in the first fetch to avoid this risk.

CRs-Fixed: 3885312
Change-Id: I2a81410fecdf41910d7d2eb0daf233621fe0b452
Signed-off-by: jinguiw <quic_jinguiw@quicinc.com>