mips msa configuration patch for MIPS SIMD Arch (MSA) P5600 and I6400

For P5600:
CROSS=$MTI/bin/mips-mti-linux-gnu- CFLAGS='-EL' CXXFLAGS='-EL' LDFLAGS='-EL'\
 ../configure --target=mips32-linux-gcc --cpu=p5600 --enable-msa

For I6400:
CROSS=$IMG/bin/mips-img-linux-gnu- CFLAGS='-EL' CXXFLAGS='-EL' LDFLAGS='-EL'\
 ../configure --target=mips64-linux-gcc --cpu=i6400 --enable-msa

Change-Id: Id25f721ea1f1991d5116e04dba713aebd7378f05