Provide proper (real) struct device to request_firmware() call. This fixes
following error messages:

(NULL device *): Direct firmware load for s5p-mfc-v6-v2.fw failed with error -2
(NULL device *): Direct firmware load for s5p-mfc-v6.fw failed with error -2

into a bit more meaningful ones:

s5p-mfc 11000000.codec: Direct firmware load for s5p-mfc-v6-v2.fw failed with error -2
s5p-mfc 11000000.codec: Direct firmware load for s5p-mfc-v6.fw failed with error -2
Signed-off-by: NMarek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: NSylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>