[media] s5p-mfc: Update v6 encoder buffer sizes

The patch updates few encoder buffer sizes for MFC v6.5
as per the udpdated user manual. The same buffer sizes
holds good for v7 firmware also.

Signed-off-by: Kiran AVND <avnd.kiran@samsung.com>
Signed-off-by: Arun Kumar K <arun.kk@samsung.com>
Signed-off-by: Kamil Debski <k.debski@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>