HWC/copybit: Add ceil value for downscale value

We are dividing (in downscaling case )the src rect value
to get intermediate value of dst. And due to rounding we
may not get exact ratio of src and tmp dst in kernel or
else where.Hence using ceil value.

CRs-Fixed: 618847
Change-Id: I8b95c3e00e83ff986d95e063d5927a3c57a13ff6
1 file changed