Android.mk: include sub-makefile

Signed-off-by: Zoltan Kuscsik <zoltan.kuscsik@linaro.org>
Reviewed-by: Joakim Bech <joakim.bech@linaro.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Reviewed-by: Pascal Brand <pascal.brand@linaro.org>
diff --git a/Android.mk b/Android.mk
index c6f2636..79f574e 100644
--- a/Android.mk
+++ b/Android.mk
@@ -60,3 +60,5 @@
 LOCAL_CFLAGS += -pthread
 
 include $(BUILD_EXECUTABLE)
+
+include $(LOCAL_PATH)/ta/Android.mk