mdss: ppp: allow mdp3 to map smmu for buffers used by ppp on 8909

There was a hw issue with ppp of mdp3.04 where it reads buffers
in 16x16 tiles. If the region of interest (roi) is not divisible
by 16 it will read these extra lines but not use them for blitting.
Since these extra region is outside the buffer it is necessary to
add extra padding on either side of the buffer. Though this issue
is fixed on mdp3.05, it's not complete. So add the sw workaround
back to avoid smmu reporting page faults.

Change-Id: Ia4cb056ebd55b89bb5cf21f4e67f1d36ddb4f7e2
Signed-off-by: Shivaraj Shetty <shivaraj@codeaurora.org>