include/timer.h: Fix typo in in*iti*alize in comment

Correct a typo in a comment introduced in commit »coreboot:
introduce monotonic timer API« (a421791d) [1].

[1] http://review.coreboot.org/3152

Change-Id: Ia0abc5304547d419478db1ae37b5525406fa19cc
Signed-off-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-on: http://review.coreboot.org/3261
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/include/timer.h

@@ -111,7 +111,7 @@ static inline int rela_time_cmp(const struct rela_time *t1,
 	return 1;
 }
 
-/* Iniitalize a rela_time structure. */
+/* Initialize a rela_time structure. */
 static inline struct rela_time rela_time_init_usecs(long us)
 {
 	struct rela_time t;