mainboard/google/slippy: Fix misspelled ifdef guard

Change-Id: Ie8347a3eccce51de3e938d0c3c170e59a9f74716
Signed-off-by: Ryan Salsamendi <rsalsamendi@hotmail.com>
Reviewed-on: https://review.coreboot.org/20442
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-by: Martin Roth <martinroth@google.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

src/mainboard/google/slippy/variant.h

@@ -14,7 +14,7 @@
  */
 
 #ifndef VARIANT_H
-#define VARAINT_H
+#define VARIANT_H
 
 void variant_romstage_entry(unsigned long bist);