Revert "B5 only supports 2 camera_vsync"

Revert "R3 supports 3 camera_vsync"

Revert submission 513151-1573106335012-40c5540

Reason for revert: All projects of sm7250 should support 3 camera_vsync in product release.
Reverted Changes:
I29d36484a:R3 supports 3 camera_vsync
I6cdc6e794:B5 only supports 2 camera_vsync
I3914c0383:Set the count of camera_vsync by compiling option
I9771783ef:Move sm7250_camera_vsync_2.json to project specifi...
I32c579ae9:Move sm7250_camera_vsync_2.json to project specifi...

Change-Id: I4748910edd764fe034837807648b7e62324876c7