nb/intel: Fix some spelling mistakes in comments and strings

Change-Id: I4a8297397d878e38516c8df19dd311c7ef19ec06
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/17478
Tested-by: build bot (Jenkins)
Reviewed-by: Nico Huber <nico.h@gmx.de>

src/northbridge/intel/pineview/pineview.h

@@ -184,7 +184,7 @@ struct dimminfo {
 	unsigned int	tRP;
 	unsigned int	tRCD;
 	unsigned int	tRAS;
-	unsigned int	rank_capacity_mb; /* per rank in Mega Bytes */
+	unsigned int	rank_capacity_mb; /* per rank in Megabytes */
 	u8		spd_data[256];
 };