Explicitly add libhardware include directory in Trusty build.
am: 8c589a9a18

Change-Id: I5f7f45c76008df6ea494168de7744e7d3c0b0208
diff --git a/rules.mk b/rules.mk
index 8a45aff..46f3df8 100644
--- a/rules.mk
+++ b/rules.mk
@@ -10,6 +10,9 @@
 
 MODULE_CPPFLAGS := -std=c++11
 
+MODULE_INCLUDES := \
+	$(LOCAL_DIR)/../../hardware/libhardware/include
+
 MODULE_DEPS := \
 	lib/libc \
 	lib/libc-trusty \