[PATCH v2] x86/PCI: Correct warnings about missing or incorrect SPDX license headers.

[Krzysztof Wilczynski <kw@linux.com>]

Add the missing "SPDX-License-Identifier" license header
to the arch/x86/pci/numachip.c (use the GPL-2.0 identifier
derived using the comment mentioning license from the
top of the file), and remove license boilerplate as per
a similar commit 8cfab3cf63cf ("PCI: Add SPDX GPL-2.0 to
replace GPL v2 boilerplate").

Correct existing SPDX license header in the files
drivers/pci/controller/pcie-cadence.h and
drivers/pci/controller/pcie-rockchip.h to use
correct comment style as per the section 2 "Style"
of the "Linux kernel licensing rules" (see:
Documentation/process/license-rules.rst).

Both changes will resolve the following checkpatch.pl
script warning:

WARNING: Missing or malformed SPDX-License-Identifier tag in line 1

Signed-off-by: Krzysztof Wilczynski <kw@linux.com>
---
Changes in v2:
  Update wording and mention checkpatch.pl script warnings.
  Add two C header files to which the fix also applies.

 arch/x86/pci/numachip.c                | 5 +----
 drivers/pci/controller/pcie-cadence.h  | 2 +-
 drivers/pci/controller/pcie-rockchip.h | 2 +-
 3 files changed, 3 insertions(+), 6 deletions(-)

diff --git a/arch/x86/pci/numachip.c b/arch/x86/pci/numachip.c
index 2e565e65c893..01a085d9135a 100644
--- a/arch/x86/pci/numachip.c
+++ b/arch/x86/pci/numachip.c
@@ -1,8 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
- * This file is subject to the terms and conditions of the GNU General Public
- * License.  See the file "COPYING" in the main directory of this archive
- * for more details.
- *
  * Numascale NumaConnect-specific PCI code
  *
  * Copyright (C) 2012 Numascale AS. All rights reserved.
diff --git a/drivers/pci/controller/pcie-cadence.h b/drivers/pci/controller/pcie-cadence.h
index ae6bf2a2b3d3..f1cba3931b99 100644
--- a/drivers/pci/controller/pcie-cadence.h
+++ b/drivers/pci/controller/pcie-cadence.h
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+/* SPDX-License-Identifier: GPL-2.0 */
 // Copyright (c) 2017 Cadence
 // Cadence PCIe controller driver.
 // Author: Cyrille Pitchen <cyrille.pitchen@free-electrons.com>
diff --git a/drivers/pci/controller/pcie-rockchip.h b/drivers/pci/controller/pcie-rockchip.h
index 8e87a059ce73..53e4f9e59624 100644
--- a/drivers/pci/controller/pcie-rockchip.h
+++ b/drivers/pci/controller/pcie-rockchip.h
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0+
+/* SPDX-License-Identifier: GPL-2.0+ */
 /*
  * Rockchip AXI PCIe controller driver
  *
-- 
2.22.1