exynos: fimg2d: fix comment for G2D_COEFF_MODE_GB_COLOR

The coefficient mode enables use of global color, not alpha.

Signed-off-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
Tested-by: Joonyoung Shim <jy0922.shim@samsung.com>
1 file changed