hwmon module unit-tests -- first one

This patchset just starts the process of adding unit-tests
to the hwmon module.

Change-Id: I569aa97658b0ff56634ddf1a599fedb4caa95abe
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/Makefile.am b/Makefile.am
index 27db186..d2b7989 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -27,4 +27,4 @@
 	timer.cpp \
 	hwmon.cpp
 
-SUBDIRS = . msl tools
+SUBDIRS = . msl test tools