clk: actions: Use the correct style for SPDX License Identifier

This patch corrects the SPDX License Identifier style
in header files related to Clock Drivers for Actions Semi Socs.
For C header files Documentation/process/license-rules.rst
mandates C-like comments (opposed to C source files where
C++ style should be used)

Changes made by using a script provided by Joe Perches here:
https://lkml.org/lkml/2019/2/7/46Suggested-by: Joe Perches <joe@perches.com>
Signed-off-by: Nishad Kamdar <nishadkamdar@gmail.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

drivers/clk/actions/owl-common.h

-// SPDX-License-Identifier: GPL-2.0+
+/* SPDX-License-Identifier: GPL-2.0+ */
 //
 // OWL common clock driver
 //

drivers/clk/actions/owl-composite.h

-// SPDX-License-Identifier: GPL-2.0+
+/* SPDX-License-Identifier: GPL-2.0+ */
 //
 // OWL composite clock driver
 //

drivers/clk/actions/owl-divider.h

-// SPDX-License-Identifier: GPL-2.0+
+/* SPDX-License-Identifier: GPL-2.0+ */
 //
 // OWL divider clock driver
 //

drivers/clk/actions/owl-factor.h

-// SPDX-License-Identifier: GPL-2.0+
+/* SPDX-License-Identifier: GPL-2.0+ */
 //
 // OWL factor clock driver
 //

drivers/clk/actions/owl-fixed-factor.h

-// SPDX-License-Identifier: GPL-2.0+
+/* SPDX-License-Identifier: GPL-2.0+ */
 //
 // OWL fixed factor clock driver
 //

drivers/clk/actions/owl-gate.h

-// SPDX-License-Identifier: GPL-2.0+
+/* SPDX-License-Identifier: GPL-2.0+ */
 //
 // OWL gate clock driver
 //

drivers/clk/actions/owl-mux.h

-// SPDX-License-Identifier: GPL-2.0+
+/* SPDX-License-Identifier: GPL-2.0+ */
 //
 // OWL mux clock driver
 //

drivers/clk/actions/owl-pll.h

-// SPDX-License-Identifier: GPL-2.0+
+/* SPDX-License-Identifier: GPL-2.0+ */
 //
 // OWL pll clock driver
 //

drivers/clk/actions/owl-reset.h

-// SPDX-License-Identifier: GPL-2.0-or-later
+/* SPDX-License-Identifier: GPL-2.0-or-later */
 //
 // Actions Semi Owl SoCs Reset Management Unit driver
 //