Change how hwmon.pl is invoked for MRW systems

This minor tweak removes the need for MRW using systems
to append the phosphor-hwmon recipe in their layer.

Change-Id: I3d9dcfff452e26d191df37ae7d759c6c2c3f2cd4
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-phosphor/common/recipes-phosphor/sensors/phosphor-hwmon.bb b/meta-phosphor/common/recipes-phosphor/sensors/phosphor-hwmon.bb
index d7a2d6d..11e968f 100644
--- a/meta-phosphor/common/recipes-phosphor/sensors/phosphor-hwmon.bb
+++ b/meta-phosphor/common/recipes-phosphor/sensors/phosphor-hwmon.bb
@@ -23,6 +23,8 @@
         phosphor-logging \
         "
 
+RRECOMMENDS_${PN} += "${VIRTUAL-RUNTIME_phosphor-hwmon-config}"
+
 SRC_URI += "git://github.com/openbmc/phosphor-hwmon"
 SRC_URI += "file://70-hwmon.rules"