s5p-mfc: Adding MFC v7 and v8 firmwares

Adding the following firmware files for MFC
s5p-mfc-v7.fw: Used in exynos 5420
s5p-mfc-v8.fw: Used in exynos 5800
Signed-off-by: Arun Kumar K <arun.kk@samsung.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

WHENCE

@@ -2253,6 +2253,8 @@ Driver: s5p-mfc - Samsung MFC video encoder/decoder driver
 File: s5p-mfc/s5p-mfc.fw
 File: s5p-mfc/s5p-mfc-v6.fw
 File: s5p-mfc/s5p-mfc-v6-v2.fw
+File: s5p-mfc/s5p-mfc-v7.fw
+File: s5p-mfc/s5p-mfc-v8.fw
 
 Licence:
 Samsung grants permission to use and redistribute aforementioned firmware