Add gtest for Targeting class

Change-Id: I10d00d56561c52c479052d2e04630cc326091aa0
Signed-off-by: Matt Spinler <spinler@us.ibm.com>
diff --git a/Makefile.am b/Makefile.am
index f1af749..ef50fa1 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -10,3 +10,5 @@
 
 openpower_proc_control_LDFLAGS = $(PHOSPHOR_LOGGING_LIBS) -lstdc++fs
 openpower_proc_control_CXXFLAGS = $(PHOSPHOR_LOGGING_CFLAGS)
+
+SUBDIRS = test