hwc: rgz: Refactor how the blit parameters are set

This patch basically refactors the way the blit parameters are set
per subregion. The intention is to make the code ready to introduce
the scaling support easier and reduce greatly redundant code as well

Change-Id: I2b32056bf2fec1b636fda1c8df9964d90d51192c
Signed-off-by: Gustavo Diaz Prado <a0273371@ti.com>
(cherry picked from commit d8cd439184093184b21291c37702b3eb7c9c836b)
1 file changed