Hwcomposer: support video play

Modify softwareRenderer.cpp, change the color format to BGR to let
video display normal

Signed-off-by: LiuXin <liuxing@embedinfo.com>
Video play: Change video align size from 32 to 16

Some videos such as 176x144 could not display normal because 176 is align with
16, with this modification, it could paly normal

Signed-off-by: LiuXin <liuxing@embedinfo.com>