msm: camera: isp: Set bubble processing flag

Currently the flag was set only during cases when there was no
bubble, setting the flag even in cases where in bubble state the
req bubbles again.

Change-Id: I60ac2fdf61a49a825d48d69d379f2edfdc94e7e4
Signed-off-by: Karthik Anantha Ram <kartanan@codeaurora.org>