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/drivers/maxim/max77686/max77686.h

@@ -127,4 +127,4 @@ int max77686_volsetting(unsigned int bus, enum max77686_regnum reg,
  */
 int max77686_disable_backup_batt(unsigned int bus);
 
-#endif /* __MAX77686_PMIC_H_ */
+#endif /* __MAX77686_H_ */