msm: camera: common: Enabling EOF support for flash

New usecase for flash driver requires to be trigger at EOF.
This change adds the new operation code support in flash
driver along with EOF enable support in crm and across
other drivers. Also to improve the performance, this change
adds the logic to dynamically update the subscribe event to
CRM, so that CRM can enqueue EOF events when Flash or any other
device add the request for EOF.

CRs-Fixed: 2633194
Change-Id: I2f68ac7fc6a4699debd39b64319728cdf17bbcfa
Signed-off-by: Jigarkumar Zala <jzala@codeaurora.org>