southbridge/amd/sb700: Allow use of auxiliary SMBUS controller

Change-Id: I29ece10eeefc2c75a3829c169f1e1aede7194ec2
Signed-off-by: Timothy Pearson <tpearson@raptorengineeringinc.com>
Reviewed-on: http://review.coreboot.org/12079
Reviewed-by: Peter Stuge <peter@stuge.se>
Tested-by: build bot (Jenkins)

src/device/Kconfig

@@ -192,6 +192,10 @@ config MULTIPLE_VGA_ADAPTERS
 	bool
 	default n
 
+config SMBUS_HAS_AUX_CHANNELS
+	bool
+	default n
+
 config SPD_CACHE
 	bool
 	default n