msm: camera: ope: Avoid deadlock in OPE PF handling

In OPE fault handler, while dumping pf info ctx_mutex is
acquired and corresponding page fault ops is called. In
pagefault ops same mutex is getting acquired again causing
a dead lock.

This commit avoids locking the same mutex again.

CRs-Fixed: 3419490
Change-Id: I2e37f725865d091f2cb682fc62f5d21278b93959
Signed-off-by: Shivakumar Malke <quic_smalke@quicinc.com>