onclite: sepolicy: Add vendor prefix for fm_prop

- Fixes build after LA.UM.9.2.r1-02700-SDMxx0.0 merge in device/qcom/sepolicy-legacy-um.

Change-Id: I1cd1366a1c7bc99a8131ca6c9558aefcfa51967f

sepolicy/vendor_init.te

@@ -10,4 +10,4 @@ allow vendor_init {
   wpa_socket
 }:dir { create search getattr open read setattr ioctl write add_name remove_name rmdir relabelfrom };
 
-allow vendor_init fm_prop:file { getattr open read };
+allow vendor_init vendor_fm_prop:file { getattr open read };