drm/amdgpu: Fix incorrect filenames in sysfs comments

This looks like a standard copy/paste mistake. Replace the incorrect
serial_number references with product_name and product_model
Signed-off-by: Kent Russell <kent.russell@amd.com>
Reviewed-by: Harish Kasiviswanathan <Harish.Kasiviswanathan@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_device.c

@@ -164,7 +164,7 @@ static void amdgpu_device_get_pcie_info(struct amdgpu_device *adev);
  *
  * The amdgpu driver provides a sysfs API for reporting the product name
  * for the device
- * The file serial_number is used for this and returns the product name
+ * The file product_name is used for this and returns the product name
  * as returned from the FRU.
  * NOTE: This is only available for certain server cards
  */
@@ -186,7 +186,7 @@ static DEVICE_ATTR(product_name, S_IRUGO,
  *
  * The amdgpu driver provides a sysfs API for reporting the part number
  * for the device
- * The file serial_number is used for this and returns the part number
+ * The file product_number is used for this and returns the part number
  * as returned from the FRU.
  * NOTE: This is only available for certain server cards
  */