arm64: fix comment in relocate_64.S

There are two typos in the comment "invalide i-cache is enabled".
We can fix it by
  invalide -> invalidate
  is       -> if

Or, if we want to match the comment to the code, we can say
"skip invalidating i-cache if disabled".

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

arch/arm/lib/relocate_64.S

@@ -68,7 +68,7 @@ relocate_done:
 	b	0f
 1:	mrs	x0, sctlr_el1
 0:	tbz	w0, #2, 5f	/* skip flushing cache if disabled */
-	tbz	w0, #12, 4f	/* invalide i-cache is enabled */
+	tbz	w0, #12, 4f	/* skip invalidating i-cache if disabled */
 	ic	iallu		/* i-cache invalidate all */
 	isb	sy
 4:	ldp	x0, x1, [sp, #16]