exynos: fimg2d: remove TRUE/FALSE from header

The fimg2d header was defining TRUE and FALSE, but actually
these defines are just used once. Remove them, since they
don't make the code better readable/understandable.

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