x86: Correct condition for init_cache_f_r()

The condition here is reversed, which makes link and coral very slow,
leading to lab failures.

Signed-off-by: Simon Glass <sjg@chromium.org>
Fixes 6182d2bdb6 ("common: board: make initcalls static")

common/board_f.c

@@ -1044,7 +1044,7 @@ void board_init_f(ulong boot_flags)
  */
 static void initcall_run_f_r(void)
 {
-#if CONFIG_IS_ENABLED(X86_64)
+#if !CONFIG_IS_ENABLED(X86_64)
 	INITCALL(init_cache_f_r);
 #endif
 }