drm/exynos: fimd: actually disable dp clock
drm/exynos: fimd: actually disable dp clock

fimd_dp_clock_enable() was setting the always to enabled,
this patch fix this to actually use the value that is set to 'val'.

Reported-by: Emilio López <ed57e40e10c7ee41d8e4853091267249e128fb62@collabora.co.uk>
Signed-off-by: Gustavo Padovan <029a69b25713d0799b81c0a39685b4c040fa1425@collabora.co.uk>
Signed-off-by: Inki Dae <bae4a7a27bbc965064e97edd6e179ac4979db440@samsung.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs