AMD cimx/sb800: Disconnect PCI bridge 0:14.4 from pins

Some GPIO pins are shared with PCI bridge 0:14.4.

As our PCI subsystem currently does not configure PCI bridges that are
marked disabled, but remain visible in the hardware, simply setting 0:14.4
disabled in the devicetree does not work here yet.

Change-Id: Ib9652e12a888e1d797d879d97737ba4101b7029a
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/8495
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-by: Nicolas Reinecke <nr@das-labor.org>
Tested-by: build bot (Jenkins)
diff --git a/src/southbridge/amd/cimx/sb800/chip.h b/src/southbridge/amd/cimx/sb800/chip.h
index 2c2ce1e..f0ce075 100644
--- a/src/southbridge/amd/cimx/sb800/chip.h
+++ b/src/southbridge/amd/cimx/sb800/chip.h
@@ -35,6 +35,7 @@
 struct southbridge_amd_cimx_sb800_config
 {
 	u32 boot_switch_sata_ide : 1;
+	u32 disconnect_pcib : 1;
 	u8  gpp_configuration;
 
 	/*