avcodec/mips: Improve hevc sao band filter msa functions

Preload data in band filter 0-8 for better pipeline parallelization.
Signed-off-by: Kaustubh Raste <kaustubh.raste@imgtec.com>
Reviewed-by: Manojkumar Bhosale <Manojkumar.Bhosale@imgtec.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavutil/mips/generic_macros_msa.h

@@ -1574,6 +1574,7 @@
     out0 = (RTYPE) __msa_ilvr_h((v8i16) in0, (v8i16) in1);  \
     out1 = (RTYPE) __msa_ilvl_h((v8i16) in0, (v8i16) in1);  \
 }
+#define ILVRL_H2_UB(...) ILVRL_H2(v16u8, __VA_ARGS__)
 #define ILVRL_H2_SB(...) ILVRL_H2(v16i8, __VA_ARGS__)
 #define ILVRL_H2_SH(...) ILVRL_H2(v8i16, __VA_ARGS__)
 #define ILVRL_H2_SW(...) ILVRL_H2(v4i32, __VA_ARGS__)