meta-ibm: witherspoon: Enable raw KCS driver

Replaces the obsolete MCTP LPC driver.

Change-Id: Ic5f7f6ec796bff8f0628d53e09a7437a74399ef4
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
diff --git a/meta-ibm/recipes-kernel/linux/linux-aspeed/witherspoon.cfg b/meta-ibm/recipes-kernel/linux/linux-aspeed/witherspoon.cfg
index dc41d58..9d5ebfb 100644
--- a/meta-ibm/recipes-kernel/linux/linux-aspeed/witherspoon.cfg
+++ b/meta-ibm/recipes-kernel/linux/linux-aspeed/witherspoon.cfg
@@ -5,3 +5,6 @@
 CONFIG_RTC_DRV_RV8803=y
 CONFIG_IIO=y
 CONFIG_BMP280=y
+CONFIG_IPMI_KCS_BMC=y
+CONFIG_IPMI_KCS_BMC_CDEV_RAW=y
+CONFIG_ASPEED_KCS_IPMI_BMC=y