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>
1 file changed