msm_fb: Don't split solid color rectangles

Blit rectangles are sometimes split into two or more.
This messes up solid color blitting. Furthermore,
we never need to split solid color rectangles anyway.

CRs-Fixed: 570638
Change-Id: I495074da65ecac54da7134a39eb2ae7e78a856ab
Signed-off-by: Diego Wilson <dwilson@codeaurora.org>
Merge "msm_fb: Don't split solid color rectangles"