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/device/dram/ddr3.h

@@ -309,4 +309,4 @@ mrs_cmd_t ddr3_get_mr2(enum ddr3_mr2_rttwr rtt_wr,
 mrs_cmd_t ddr3_get_mr3(char dataflow_from_mpr);
 mrs_cmd_t ddr3_mrs_mirror_pins(mrs_cmd_t cmd);
 
-#endif				/* DEVICE_DRAM_DDR3_H */
+#endif /* DEVICE_DRAM_DDR3L_H */