Update build framework for PowerSupply fault app

Change-Id: I98a75efc88d92de0ab016a77d5dd4a1e9345df83
Signed-off-by: Brandon Wyman <bjwyman@gmail.com>
diff --git a/Makefile.am b/Makefile.am
index ae6014f..a3330fd 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -33,4 +33,4 @@
 	@mkdir -p `dirname $@`
 	$(SDBUSPLUSPLUS) -r $(srcdir) error exception-cpp xyz.openbmc_project.Power.Fault > $@
 
-SUBDIRS = . power-sequencer test
+SUBDIRS = . power-sequencer power-supply test