Add a property used to enable Vulkan as default render pipeline

Test: Booted with Vulkan rendering
Change-Id: I00485c16e5a878321a699f35d28fb85834991255

public/property_contexts

@@ -309,6 +309,7 @@ ro.hardware.vehicle u:object_r:exported_default_prop:s0 exact string
 ro.hardware.vibrator u:object_r:exported_default_prop:s0 exact string
 ro.hardware.virtual_device u:object_r:exported_default_prop:s0 exact string
 ro.hardware.vulkan u:object_r:exported_default_prop:s0 exact string
+ro.hwui.use_vulkan u:object_r:exported_default_prop:s0 exact bool
 ro.kernel.qemu u:object_r:exported_default_prop:s0 exact bool
 ro.kernel.qemu. u:object_r:exported_default_prop:s0
 ro.kernel.android.bootanim u:object_r:exported_default_prop:s0 exact int