[PHI] Migrate elementwise_sub kernel (#48611)

* Add migrations

* Fix build errors

* Remove elementwise_mul from migration

Author: piotrekobi

paddle/fluid/operators/elementwise/mkldnn/elementwise_sub_mkldnn_op.cc

@@ -416,6 +416,15 @@ PD_REGISTER_KERNEL(elementwise_pow,
 #endif
 
 #if defined PADDLE_WITH_MKLDNN
+PD_REGISTER_KERNEL(subtract,
+                   OneDNN,
+                   ONEDNN,
+                   phi::SubtractKernel,
+                   float,
+                   phi::dtype::bfloat16,
+                   int8_t,
+                   uint8_t) {}
+
 PD_REGISTER_KERNEL(
     divide, OneDNN, ONEDNN, phi::DivideKernel, float, phi::dtype::bfloat16) {}
 #endif

paddle/phi/kernels/elementwise_kernel.cc

@@ -133,10 +133,20 @@ void ElementwiseKernel(const OneDNNContext& dev_ctx,
     ElementwiseKernel<T, algorithm>(dev_ctx, x, y, axis, out); \
   }
 
+DEFINE_ONEDNN_ELEMENTWISE_KERNEL(Subtract, dnnl::algorithm::binary_sub)
 DEFINE_ONEDNN_ELEMENTWISE_KERNEL(Divide, dnnl::algorithm::binary_div)
 
 }  // namespace phi
 
+PD_REGISTER_KERNEL(subtract_raw,
+                   OneDNN,
+                   ONEDNN,
+                   phi::SubtractRawKernel,
+                   float,
+                   phi::dtype::bfloat16,
+                   int8_t,
+                   uint8_t) {}
+
 PD_REGISTER_KERNEL(divide_raw,
                    OneDNN,
                    ONEDNN,