msm: isp: Handle pingpong bit mismatch gracefully

Ping pong mismatch occurs when the interrupts miss happens.
Handle this scenario properly by sending error to userspace.

Change-Id: Idd8f9979a9b0e8c6a1989dd89ed6b98ccaa54ac9
Signed-off-by: Abhishek Kondaveeti <akondave@codeaurora.org>