video: msm: wfd: Allocate bigger buffers for non-16 byte aligned heights

WFD driver now rejects non-16 byte aligned widths as MDP cannot add the
necessary padding.  For height, as the hardware will access up to the
next 16 aligned address, we need to allocate a bigger buffer to prevent
page faults.

Change-Id: Ib8aa6ecc827c31eb20c9cd3428d82a62f3668e5b
Signed-off-by: Deva Ramasubramanian <dramasub@codeaurora.org>