msm: vidc: Update compilation flag for video driver

Both 8226 and 8610 shared same arch flag. Now they are seperated so
adding 8226 flag for compilating of video driver on 8226 target.

Change-Id: I619eb9594c0d853d1f68a05e0012f61e881c42d3
Signed-off-by: Ashray Kulkarni <ashrayk@codeaurora.org>