The max transform depth is 5(from 0 to 4), so we need 5 cabac states for
cbf_cb and cbf_cr.

See Table 9-4 for details.
Signed-off-by: Xu Guangxin <guangxin.xu@intel.com>
Signed-off-by: Linjie Fu <linjie.fu@intel.com>
Signed-off-by: James Almer <jamrial@gmail.com>