sb/amd/cimx/sb[89]00: Use CF9 reset

Implement board_reset() as "system reset".

Change-Id: I2d277b0845b4e8977b68892c2e5e00d8918e063f
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/29056
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/southbridge/amd/cimx/sb800/Kconfig b/src/southbridge/amd/cimx/sb800/Kconfig
index 07232f1..aa5160b 100644
--- a/src/southbridge/amd/cimx/sb800/Kconfig
+++ b/src/southbridge/amd/cimx/sb800/Kconfig
@@ -19,7 +19,8 @@
 	select IOAPIC
 	select HAVE_USBDEBUG_OPTIONS
 	select AMD_SB_CIMX
-	select HAVE_HARD_RESET
+	select HAVE_CF9_RESET
+	select HAVE_CF9_RESET_PREPARE
 
 if SOUTHBRIDGE_AMD_CIMX_SB800
 config BOOTBLOCK_SOUTHBRIDGE_INIT