msm: camera: isp: State monitoring in isp for error logging

Maintaining a buffer to keep track of current state and the
incoming request type as part of the activated state irq.
When an error occurs this buffer can be dumped for analysis.

Change-Id: Iba2d9bd696a5fa20438f2da2ebadaf695d34afe9
Signed-off-by: Karthik Anantha Ram <kartanan@codeaurora.org>
Signed-off-by: vhajeri <vhajeri@codeaurora.org>