[CANN]MUL_MAT optimization

[noemotiovon]

Optimize the MUL_MAT operator for the CANN backend. When the underlying aclnnWeightQuantBatchMatmulV2 operator is called and k <= QK8_0, use the per_channel algorithm instead of the per_group algorithm.

Test Cases

  MUL_MAT(type_a=q8_0,type_b=f32,m=16,n=1,k=32,bs=[1,1],nr=[1,1],per=[0,1,2,3]): OK
  MUL_MAT(type_a=q8_0,type_b=f32,m=16,n=1,k=256,bs=[1,1],nr=[1,1],per=[0,1,2,3]): OK