exynos/fimg2d: remove superfluous initialization of g2d_point_val

The g2d_point_val union consists of two coordinates of 16
bits. Whenever this union is used though, both coordinates
are explicitly set. Hence prior initialization is unnecessary.

Signed-off-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>