m20lte: Use Soong namespace to avoid device build conflicts

Change-Id: Id04f464102264b6f2e8d49b39389c7e346613b39
diff --git a/Android.bp b/Android.bp
new file mode 100644
index 0000000..9515b25
--- /dev/null
+++ b/Android.bp
@@ -0,0 +1,2 @@
+soong_namespace {
+}
diff --git a/device.mk b/device.mk
index 156996d..84c861f 100644
--- a/device.mk
+++ b/device.mk
@@ -20,3 +20,6 @@
 	fstab.exynos7904 \
 	init.target.rc \
 	init.baseband.rc
+
+# Soong namespaces
+PRODUCT_SOONG_NAMESPACES += $(LOCAL_PATH)