mdss: mdp: use file descriptor node info to track clients

FB clients are tracked using process id. The process id does
not match if open and close API callers are different. Track
the fb clients using file descriptor node id in such cases
and release all resources associated with that process id
gracefully.

CRs-fixed: 652449
Signed-off-by: Dhaval Patel <pdhaval@codeaurora.org>
(cherry picked from commit 2e976e26ae729f0dcdcde34451377121fdd986c4)

Conflicts:
	drivers/video/msm/mdss/mdss_fb.c

Change-Id: Ibb64be16502c8b99168006233ab2874935b75151