msm: camera: isp: Configure composite stats for VFE32

Multiple stats interrupts will be consolidated as specified by
individual stats modules and a notification event will be sent
to userspace to process these composite stats. A module can be
configured to provide stats update individually also.

Change-Id: I7808d68afbd4b9814a289a5cacbf6dd1ba187f24
Signed-off-by: Venu Yeshala <vyeshala@codeaurora.org>