nb/via/cx700/romstage: Include missing static.h header

Commit 755ecc259c ("nb/via/cx700: Implement raminit") is missing an
include for static.h and breaks the main branch. Fix it.

Change-Id: I836ab03b4eba6f32a2ae576eafc465543179cd05
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/85232
Reviewed-by: Subrata Banik <subratabanik@google.com>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/northbridge/via/cx700/romstage.c

@@ -8,6 +8,7 @@
 #include <static_devices.h>
 #include <arch/romstage.h>
 #include <cbmem.h>
+#include <static.h>
 
 #include "chip.h"
 #include "raminit.h"