meta-witherspoon: Disable unnecessary hardware features

Change-Id: Ic458867d5962b21146d7042fb315ccde8128eb75
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 1ccdeb3..76be4ae 100644
--- a/meta-witherspoon/conf/distro/openbmc-witherspoon.conf
+++ b/meta-witherspoon/conf/distro/openbmc-witherspoon.conf
@@ -3,3 +3,4 @@
 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/phosphor-isolation.inc