Add gpio-keys kernel feature

Add a gpio-keys feature to be used with KERNEL_FEATURES.

Change-Id: I0f96b842a55b38eb573ad894f79ef4621b97e839
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-phosphor/conf/distro/openbmc-phosphor.conf b/meta-phosphor/conf/distro/openbmc-phosphor.conf
index fa488e5..abea01e 100644
--- a/meta-phosphor/conf/distro/openbmc-phosphor.conf
+++ b/meta-phosphor/conf/distro/openbmc-phosphor.conf
@@ -56,3 +56,6 @@
 #  the version in RHEL6.4.
 INHERIT_remove = " uninative"
 OLDEST_KERNEL = "2.6.32"
+
+KERNEL_FEATURES_append = " phosphor-gpio-keys"
+KERNEL_FEATURES_remove_qemuall = " phosphor-gpio-keys"