Add compat for old wcnss_filter

* New one has "vendor." prefix for all it's props.

Change-Id: I4fa29aa68ce946c5368e22d9042762bc7ae869bb
diff --git a/libbt-vendor/Android.mk b/libbt-vendor/Android.mk
index a7161ab..091dfec 100644
--- a/libbt-vendor/Android.mk
+++ b/libbt-vendor/Android.mk
@@ -96,6 +96,9 @@
 ifeq ($(QCOM_BT_READ_ADDR_FROM_PROP),true)
 LOCAL_CFLAGS += -DREAD_BT_ADDR_FROM_PROP
 endif
+ifeq ($(QCOM_BT_USE_OLD_WCNSS_FILTER),true)
+LOCAL_CFLAGS += -DUSE_OLD_WCNSS_FILTER
+endif
 
 #include $(LOCAL_PATH)/vnd_buildcfg.mk