fs:fuse: Disable shortcircuit when mmap is called on a file

When some data is written to a file both mmap and regular io
there can be race conditions that can cause incorrect data
to be saved.

Disable shortcircuit on the specific files on which  mmap is called
until we add mmap support to shortcircuit.

Change-Id: Ic24219ab22d3130aa7e9e998a9e6798648a7321c
Signed-off-by: Nikhilesh Reddy <reddyn@codeaurora.org>
Signed-off-by: Srinivasarao P <spathi@codeaurora.org>