msm: mdss: Handle solid fill call with width one correctly

If userspace calls solid fill with width one, even alignment in
driver will make it zero and this will result in page fault.
Handle this case in driver by making this width two rather than
zero if it is not crossing the buffer boundary.

Change-Id: I84c9ed7e029cb98f4fb7c5d92e09fd2a54d74662
Signed-off-by: Shivaraj Shetty <shivaraj@codeaurora.org>