emulator: allows vendor_init to set qemu_props

BUG: 109872686

this cl only impacts emulator images

Change-Id: I93b8489f710d194917d4b482ebca960c39658fd9
diff --git a/target/board/generic/sepolicy/vendor_init.te b/target/board/generic/sepolicy/vendor_init.te
new file mode 100644
index 0000000..b18d391
--- /dev/null
+++ b/target/board/generic/sepolicy/vendor_init.te
@@ -0,0 +1 @@
+set_prop(vendor_init, qemu_prop)