compile the AD7418 driver into the kernel

SVN-Revision: 10983

target/linux/ixp4xx/config-default

@@ -403,6 +403,7 @@ CONFIG_RWSEM_GENERIC_SPINLOCK=y
 # CONFIG_SENSORS_ADM1029 is not set
 # CONFIG_SENSORS_ADM1031 is not set
 # CONFIG_SENSORS_ADM9240 is not set
+CONFIG_SENSORS_AD7418=y
 # CONFIG_SENSORS_ADT7470 is not set
 # CONFIG_SENSORS_ASB100 is not set
 # CONFIG_SENSORS_ATXP1 is not set