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/include/console/ne2k.h

@@ -37,4 +37,4 @@ static inline void __ne2k_tx_byte(u8 data)	{}
 static inline void __ne2k_tx_flush(void)	{}
 #endif
 
-#endif /* _NE2K_H */
+#endif /* _NE2K_H__ */

src/include/console/post_codes.h

@@ -487,4 +487,4 @@
 
 #define POST_INTR_SEG_JUMP			(0x0F0)
 
-#endif /* THE_ALMIGHTY_POST_CODES_H */
+#endif /* POST_CODES_H */