video: s3c-fb: fix transparency length for pixel blending

Transparency length is fixed for pixel blending in order to support
ARGB 8888 format.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
1 file changed