meta-ibm: Remove tacoma-specific options from witherspoon

The KCS device is only used on Tacoma, so move them out to their own
file.

Signed-off-by: Joel Stanley <joel@jms.id.au>
Change-Id: I157a597c753440220b1e92b60191a0c5191e4aec
diff --git a/meta-ibm/recipes-kernel/linux/linux-aspeed/witherspoon-tacoma.cfg b/meta-ibm/recipes-kernel/linux/linux-aspeed/witherspoon-tacoma.cfg
new file mode 100644
index 0000000..8851c79
--- /dev/null
+++ b/meta-ibm/recipes-kernel/linux/linux-aspeed/witherspoon-tacoma.cfg
@@ -0,0 +1,3 @@
+CONFIG_IPMI_KCS_BMC=y
+CONFIG_IPMI_KCS_BMC_CDEV_RAW=y
+CONFIG_ASPEED_KCS_IPMI_BMC=y