This patch adds the memory to memory (m2m) interface functionality
for the G-Scaler driver.

[mchehab@redhat.com: Fixed a small coding style issue:
 sizeof *ctx should be sizeof(*ctx)]
Signed-off-by: NHynwoong Kim <khw0178.kim@samsung.com>
Signed-off-by: NSungchun Kang <sungchun.kang@samsung.com>
Signed-off-by: NShaik Ameer Basha <shaik.ameer@samsung.com>
Reviewed-by: NSylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: NSylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>