msm: mdss: release pipes associated with respective process

It is possible that fb_open and fb_release APIs are called
from different processes for same file node. fb_release
finds correct process through file descriptor node in
such scenario and releases respective ref count. However,
overlay_release API tries to release the pipes associated
with current process id. This check fails to find correct
resources and does not release any pipe. This change calls
overlay release API with respective process id to release
all pipes associated with it.

Change-Id: Icc176032401483e05f347d3c08a4b344f61686f2
Signed-off-by: Dhaval Patel <pdhaval@codeaurora.org>