Camera: Disable livesnapshot for 4kx2k video

1) Since livesnapshot is not supported for 4kx2k video size,
   disable it from the UI.
2) Revert parts of commit 2c309499e60120ec513f51bfab02e7d54237af0a
   to get 4kx2k video recording working.

Change-Id: I837f242d505d2c2f07aeb33d81c2560f5b645a39