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/ironlake/bootblock.c b/src/northbridge/intel/ironlake/bootblock.c
index 6610a3e..241eb43 100644
--- a/src/northbridge/intel/ironlake/bootblock.c
+++ b/src/northbridge/intel/ironlake/bootblock.c
@@ -22,7 +22,7 @@
 {
 	/*
 	 * The QuickPath bus number is the topmost bus number, as per the value
-	 * of the SAD_PCIEXBAR register. The register defaults to 256 busses on
+	 * of the SAD_PCIEXBAR register. The register defaults to 256 buses on
 	 * reset. Thus, hardcode the bus number when first setting up PCIEXBAR.
 	 */
 	const pci_devfn_t qpi_sad = PCI_DEV(255, 0, 1);