video: fbdev: s3c-fb: remove s5p64x0 related fimd codes

This patch removes fimd codes for s5p6440 and s5p6450 SoCs.

Acked-by: Jingoo Han <jg1.han@samsung.com>
Acked-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>