replace customize bf16_to_fp32 with arm neon vcvtah_f32_bf16 #5181
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This pr is to replace hack func to cast bf16 to fp32 with standard arm neon intrinsics in arm64 sbgemv_n kernel in previous pr: #5160.
This PR may also slightly improve performance by reducing a cast from two to one assembly instruction—specifically, replacing (UMOV, UBFIZ) with SHL