src/mainboard to src/security: Fix spelling errors

These issues were found and fixed by codespell, a useful tool for
finding spelling errors.

Signed-off-by: Martin Roth <martin@coreboot.org>
Change-Id: Ie34003a9fdfe9f3b1b8ec0789aeca8b9435c9c79
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58081
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
diff --git a/src/northbridge/intel/i945/Kconfig b/src/northbridge/intel/i945/Kconfig
index 51ee320..ac19fcc 100644
--- a/src/northbridge/intel/i945/Kconfig
+++ b/src/northbridge/intel/i945/Kconfig
@@ -63,7 +63,7 @@
 config CHECK_SLFRCS_ON_RESUME
 	def_bool n
 	help
-	  On some boards it may be neccessary to hard reset early
+	  On some boards it may be necessary to hard reset early
 	  during resume from S3 if the SLFRCS register indicates that
 	  a memory channel is not guaranteed to be in self-refresh.
 	  On other boards the check always creates a false positive,