meta-ibm: witherspoon: Enable IR35221 driver

Witherspoon uses this i2c device for vrm control and monitoring.

Signed-off-by: Joel Stanley <joel@jms.id.au>
Change-Id: I5354af5b3447e1bb2a9ba96642ec6ddc26db619d
diff --git a/meta-ibm/recipes-kernel/linux/linux-aspeed/witherspoon.cfg b/meta-ibm/recipes-kernel/linux/linux-aspeed/witherspoon.cfg
index 0b6a2e8..c9e0057 100644
--- a/meta-ibm/recipes-kernel/linux/linux-aspeed/witherspoon.cfg
+++ b/meta-ibm/recipes-kernel/linux/linux-aspeed/witherspoon.cfg
@@ -2,6 +2,7 @@
 CONFIG_SENSORS_TMP421=y
 CONFIG_SENSORS_MAX31785=y
 CONFIG_SENSORS_UCD9000=y
+CONFIG_SENSORS_IR35221=y
 CONFIG_RTC_DRV_RV8803=y
 CONFIG_IIO=y
 CONFIG_BMP280=y