witherspoon: Require openbmc-openpower configuration

This avoids some redundancy, and Witherspoon is an OpenPOWER platform
after-all.

Change-Id: Iaa74447b7e7e511521c24287c8b17ed5066c401e
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
diff --git a/meta-witherspoon/conf/distro/openbmc-witherspoon.conf b/meta-witherspoon/conf/distro/openbmc-witherspoon.conf
index 0f299fa..1ccdeb3 100644
--- a/meta-witherspoon/conf/distro/openbmc-witherspoon.conf
+++ b/meta-witherspoon/conf/distro/openbmc-witherspoon.conf
@@ -1,6 +1,5 @@
-require conf/distro/include/phosphor-base.inc
+require conf/distro/openbmc-openpower.conf
 require conf/distro/include/phosphor-ubi.inc
 require conf/distro/include/phosphor-tiny.inc
 require conf/distro/include/openpower-mrw.inc
 require conf/distro/include/openpower-ubi.inc
-require conf/distro/include/openpower-distrovars.inc