gta4xl-common: Enable SkiaVk as RenderEngine backend

This changes RenderEngine from using the SkiaGL backend to using the
SkiaVk backend.

Bug: 290248072
Test: Manual testing
Change-Id: I2e9c9fe01c84ad06116435567bb1b02b54677cef
diff --git a/vendor.prop b/vendor.prop
index 1fd943b..13d1ef3 100644
--- a/vendor.prop
+++ b/vendor.prop
@@ -42,6 +42,7 @@
 persist.sys.fuse.passthrough.enable=true
 
 ## Graphics
+debug.renderengine.backend=skiavkthreaded
 ro.hardware.egl=mali
 ro.opengles.version=196610
 ro.surface_flinger.max_frame_buffer_acquired_buffers=3