nb/intel/sandybridge: Fix typo in comment

Change-Id: I8271911695f41ef7cac1bb228309af0568e5bb0c
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47488
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>

src/northbridge/intel/sandybridge/raminit_common.c

@@ -4238,7 +4238,7 @@ void channel_scrub(ramctr_timing *ctrl)
 	 * The following loops writes to every DRAM address, setting the ECC bits to the
 	 * correct value. A read from this location will no longer return a CRC error,
 	 * except when a bit has toggled due to external events.
-	 * The same could be accieved by writing to the physical memory map, but it's
+	 * The same could be achieved by writing to the physical memory map, but it's
 	 * much more difficult due to SMM remapping, ME stolen memory, GFX stolen memory,
 	 * and firmware running in x86_32.
 	 */