fix gcc12 error: mismatched-new-delete error in custom_device.cc (#47466)

paddle/phi/backends/custom/custom_device.cc

@@ -359,8 +359,7 @@ class CustomDevice : public DeviceInterface {
       }
     } else {
       if (!pimpl_->memory_copy_p2p) {
-        std::unique_ptr<uint8_t> tmp(
-            reinterpret_cast<uint8_t*>(new uint8_t[size]));
+        std::unique_ptr<uint8_t[]> tmp(new uint8_t[size]);
         MemoryCopyD2H(src_dev_id, tmp.get(), src, size);
         MemoryCopyH2D(dst_dev_id, dst, tmp.get(), size);
       } else {
@@ -452,8 +451,7 @@ class CustomDevice : public DeviceInterface {
       PADDLE_ENFORCE_CUSTOM_DEVICE_SUCCESS(
           pimpl_->device_memory_set(device, ptr, value, size));
     } else {
-      std::unique_ptr<uint8_t> tmp(
-          reinterpret_cast<uint8_t*>(new uint8_t[size]));
+      std::unique_ptr<uint8_t[]> tmp(new uint8_t[size]);
       memset(tmp.get(), value, size);
       MemoryCopyH2D(dev_id, ptr, tmp.get(), size);
     }