polkit: add polkit as a required distro feature

Make sure polkit is in DISTRO_FEATURERS if this package is being
installed. This will make sure that people who do use polkit in
their image also do enabled the recently introduced distro feature
polkit in their distro.

Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-extended/polkit/polkit_0.115.bb

@@ -9,6 +9,8 @@ DEPENDS = "expat glib-2.0 intltool-native mozjs"
 
 inherit autotools gtk-doc pkgconfig useradd systemd gobject-introspection
 
+REQUIRED_DISTRO_FEATURES = "polkit"
+
 PACKAGECONFIG = "${@bb.utils.filter('DISTRO_FEATURES', 'pam', d)} \
                  ${@bb.utils.contains('DISTRO_FEATURES', 'systemd', 'systemd', \
                     bb.utils.contains('DISTRO_FEATURES', 'x11', 'consolekit', '', d), d)} \