Add missing pkgconfig dependencies

A number of skeleton recipes were missing pkgconfig dependencies.
Exposed by Yocto 2.3 per-recipe sysroots feature.

Change-Id: I514a95d08e199b395355341fec586b2af11428b5
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-phosphor/common/recipes-phosphor/fans/obmc-control-fan.bb b/meta-phosphor/common/recipes-phosphor/fans/obmc-control-fan.bb
index 501f54a..60bc876 100644
--- a/meta-phosphor/common/recipes-phosphor/fans/obmc-control-fan.bb
+++ b/meta-phosphor/common/recipes-phosphor/fans/obmc-control-fan.bb
@@ -4,6 +4,7 @@
 
 inherit skeleton-sdbus
 inherit obmc-phosphor-dbus-service
+inherit pkgconfig
 
 RDEPENDS_${PN} += "libsystemd"
 SKELETON_DIR = "fanctl"