i2c-piix4: Add support for the ATI SB700

Add the SMBus device ID for ATI SB700.

Signed-off-by: Henry Su <Henry.su@amd.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 838dc1c..165c126 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -207,6 +207,7 @@
 	    ATI IXP300
 	    ATI IXP400
 	    ATI SB600
+	    ATI SB700
 	    Serverworks OSB4
 	    Serverworks CSB5
 	    Serverworks CSB6