src/{commonlib,lib}: Fix typo

Change-Id: If7650ac4d9be2614a9665c7f2aba9ac5cc413efe
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/28097
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>

src/lib/selfboot.c

@@ -511,7 +511,7 @@ static int load_self_segments(struct segment *head, struct prog *payload,
 		}
 
 		/*
-		 * Each architecture can perform additonal operations
+		 * Each architecture can perform additional operations
 		 * on the loaded segment
 		 */
 		prog_segment_loaded((uintptr_t)dest, ptr->s_memsz,