This includes trivial cleanup in exynos files such as
 - remove unused header files inclusion from exynos.c, s5p-dev-mfc.c,
   firmware.c, pm.c.
 - move inclusion of of.h from common.h to pm.c where it is really
   required
Signed-off-by: NPankaj Dubey <pankaj.dubey@samsung.com>
Signed-off-by: NKrzysztof Kozlowski <k.kozlowski@samsung.com>