msm: VPU: Remove unnecessary checks on format resolution

Remove a check that height in pixels must be a multiple of 8, which is
no longer necessary.
Change get_bytesperline so that it only returns the default value if
input bytesperline is zero. Previously, the result can be random if
input bytesperline was not initialized by the caller.

Change-Id: I68b9852a9d43776274267fa1abdd06b03925026d
Signed-off-by: Ahmed Abdul-Salam <aabdulsa@codeaurora.org>