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/2019/2/7/46

Suggested-by: Joe Perches <[email protected]>
Signed-off-by: Nishad Kamdar <[email protected]>
Signed-off-by: Stephen Boyd <[email protected]>
diff --git a/drivers/clk/actions/owl-composite.h b/drivers/clk/actions/owl-composite.h
index b410ed5..bca38bf 100644
--- a/drivers/clk/actions/owl-composite.h
+++ b/drivers/clk/actions/owl-composite.h
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0+
+/* SPDX-License-Identifier: GPL-2.0+ */
 //
 // OWL composite clock driver
 //