header files: Fix guard name comments to match guard names

This just updates existing guard name comments on the header files
to match the actual #define name.
As a side effect, if there was no newline at the end of these files,
one was added.

Change-Id: Ia2cd8057f2b1ceb0fa1b946e85e0c16a327a04d7
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/12900
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/arch/arm/include/arch/clock.h

@@ -20,4 +20,4 @@
 
 void set_cntfrq(uint32_t);
 
-#endif //__ARM_CLOCK_H_
+#endif /* __ARM_CLOCK_H_ */