nb/via/vx900: Use CF9 reset

Implement board_reset() as "system reset".

Change-Id: I2b68a23cdf244884104d4ed54e19d3ab347c3a3e
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/29055
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/northbridge/via/vx900/Kconfig

@@ -20,7 +20,7 @@ config NORTHBRIDGE_VIA_VX900
 	select DRIVERS_GENERIC_IOAPIC
 	select HAVE_DEBUG_RAM_SETUP
 	select HAVE_DEBUG_SMBUS
-	select HAVE_HARD_RESET
+	select HAVE_CF9_RESET
 	select NO_RELOCATABLE_RAMSTAGE
 
 if NORTHBRIDGE_VIA_VX900

src/northbridge/via/vx900/northbridge.c

@@ -23,6 +23,7 @@
 #include <device/pci_ids.h>
 #include <cpu/cpu.h>
 #include <cbmem.h>
+#include <cf9_reset.h>
 #include <lib.h>
 #include <reset.h>
 #include <string.h>
@@ -43,9 +44,9 @@ static uint64_t uma_memory_size = 0;
  * remapping mechanism will overflow, the effects of which are unknown.
  */
 
-void do_hard_reset(void)
+void do_board_reset(void)
 {
-	outb((1 << 2) | (1 << 1), 0xcf9);
+	system_reset();
 }
 
 uint64_t get_uma_memory_base(void)