H264 decoding speed: 154fps ==> 165fps, 5.14x ==> 5.53x (tested on 3A4000)

V2: Fixed a build error in [PATCH 2/3].
"Error: opcode not supported on this processor: mips32r2 (mips32r2) `dsbh 
$10,$10'"

V3: Add a fix patch to make MSA optimization more robust.

[PATCH v3 1/4] avcodec/mips: Restore the initialization sequence of.
[PATCH v3 2/4] avcodec/mips: Refine get_cabac_inline_mips.
[PATCH v3 3/4] avcodec/mips: Optimize function.
[PATCH v3 4/4] Fix potential illegal instruction error.

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