msm: mdss: Update the dma stride value on mdp3

The frame buffer is allocated from user space. And it may have some
special alignment requirement. Rather than assuming the alignment in
the driver, this change is to use the value passed in from the
user space to configure the dma stride register.

CRs-fixed: 582796
Change-Id: Ic3884ee0a530ed1ab83b6df26ba180fd21257ae0
Signed-off-by: Shivaraj Shetty <shivaraj@codeaurora.org>