Fix LoongArch compile error with 128-bit SIMD

[junchao-loongson]

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error info:

ggml-cpu-quants.c:2263:20: error: incompatible types when initializing type ‘__m128’ using type ‘__vector(2) long long int’
ggml-cpu-quants.c:2264:20: error: incompatible types when initializing type ‘__m128’ using type ‘__vector(2) long long int’
ggml-cpu-quants.c:2265:20: error: incompatible types when initializing type ‘__m128’ using type ‘__vector(2) long long int’
ggml-cpu-quants.c:2266:20: error: incompatible types when initializing type ‘__m128’ using type ‘__vector(2) long long int’
ggml-cpu-quants.c:2271:30: error: incompatible types when initializing type ‘__m128’ using type ‘__m128i’
ggml-cpu-quants.c:2278:31: error: implicit declaration of function ‘mul_sum_i8_pairs’ [-Wimplicit-function-declaration]
ggml-cpu-quants.c:2278:31: error: incompatible types when initializing type ‘__m128i’ using type ‘int’
ggml-cpu-quants.c:2283:31: error: incompatible types when initializing type ‘__m128i’ using type ‘int’
ggml-cpu-quants.c:2289:30: error: incompatible types when initializing type ‘__m128’ using type ‘__m128i’
ggml-cpu-quants.c:2296:31: error: incompatible types when initializing type ‘__m128i’ using type ‘int’
ggml-cpu-quants.c:2301:31: error: incompatible types when initializing type ‘__m128i’ using type ‘int’
ggml-cpu-quants.c:2322:12: error: implicit declaration of function ‘hsum_float_4x4’ [-Wimplicit-function-declaration]