fix core dump when fallback gather_nd_grad and MemoryAllocateHost (#61067)

Author: raining-dark

paddle/phi/api/yaml/backward.yaml

@@ -944,8 +944,6 @@
     func : gather_nd_grad
   composite : gather_nd_grad(x, index, out_grad, x_grad)
   no_need_buffer : x
-  data_transform :
-    skip_transform : index
 
 - backward_op : gaussian_inplace_grad
   forward : gaussian_inplace(Tensor x, float mean=0, float std=1.0, int seed=0) -> Tensor(out)

paddle/phi/backends/custom/custom_device.cc

@@ -383,7 +383,7 @@ class CustomDevice : public DeviceInterface {
     void* ptr = nullptr;
     const auto device = &devices_pool[dev_id];
 
-    if (!pimpl_->unified_memory_allocate) {
+    if (!pimpl_->host_memory_allocate) {
       PADDLE_THROW(phi::errors::Unavailable(
           "MemoryAllocateHost is not supported on %s.", Type()));
     } else {