src/include: Fix typos

Change-Id: Ia8e6e5bd5ac2565263d81df8ca81d62436a3301f
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/38441
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/include/timer.h

@@ -160,7 +160,7 @@ static inline void stopwatch_tick(struct stopwatch *sw)
 }
 
 /*
- * Tick and check the stopwatch for expiration. Returns non-zero on exipration.
+ * Tick and check the stopwatch for expiration. Returns non-zero on expiration.
  */
 static inline int stopwatch_expired(struct stopwatch *sw)
 {