msm: camera: Directly use stride from buffer_plane_info

stride is already in the unit of bytes. Just need to convert
it to units of 64-bit words.

Bug: 14395767
Change-Id: I57960371911c492cab7d5ca5f710ca0f16572d77
Signed-off-by: Shuzhen Wang <shuzhenw@codeaurora.org>