src/northbridge: Fix typo

Change-Id: I00094028036f33892362b935899e1bceef1da625
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/27911
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>

src/northbridge/intel/x4x/ram_calc.c

@@ -93,7 +93,7 @@ u8 decode_pciebar(u32 *const base, u32 *const len)
 }
 
 /* Depending of UMA and TSEG configuration, TSEG might start at any
- * 1 MiB aligment. As this may cause very greedy MTRR setup, push
+ * 1 MiB alignment. As this may cause very greedy MTRR setup, push
  * CBMEM top downwards to 4 MiB boundary.
  */
 void *cbmem_top(void)