codecparsers: h264: fix mistake of pic timing payload parse.

Signed-off-by: Zhong Cong <congx.zhong@intel.com>
Cancel the estimate of version when set loop_filter_level
decoder: h264: fix assignment of LongTermFrameIdx.

Complement fix committed as e95a42e.

The H.264 AVC standard has to say: if the field is part of a reference
frame or a complementary reference field pair, and the other field of
the same reference frame or complementary reference field pair is also
marked as "used for long-term reference", the reference frame or
complementary reference field pair is also marked as "used for long-term
reference" and assigned LongTermFrameIdx equal to long_term_frame_idx.

This fixes decoding of MR9_BT_B in strict mode.

https://bugs.freedesktop.org/show_bug.cgi?id=64624
https://bugzilla.gnome.org/show_bug.cgi?id=724518

Signed-off-by: Zhong Cong <congx.zhong@intel.com>
revert findLongTermRef function.

Signed-off-by: Zhong Cong <congx.zhong@intel.com>