sapphire: Import mod_device property

Change-Id: Ide1eba4a88a17ff514baabc4b464e971e1a2bb89
Signed-off-by: ReStranger <restranger@disroot.org>
diff --git a/properties/system.prop b/properties/system.prop
new file mode 100644
index 0000000..a60c7f2
--- /dev/null
+++ b/properties/system.prop
@@ -0,0 +1,2 @@
+# Xiaomi
+ro.product.mod_device=sapphire_global