msm: camera: isp: Fix IRQ delay handling logic

Delayed IRQ handling logic measures time deference between 2 consecutive
IRQs (RUP, EPOCH BUF_DONE), if time difference is greater then 1 frame
time than, it assumes that IRQs are merged.
If KMD does not apply any request, then delay handling logic measures
delta between two epochs IRQs, which should be 1 frame time, which will
be considered delay and fence error will be signaled.
This patch handles above case.

CRs-Fixed: 2639997
Change-Id: I72ea46171d867ec7ae6e2852110a3ef10df81cf1
Signed-off-by: Ayush Kumar <ayushkr@codeaurora.org>
Signed-off-by: Trishansh Bhardwaj <tbhardwa@codeaurora.org>