[virtmagma] change path override for magma device

This change updates the path literal to point to the new standalone
magma device, instead of the existing merged wayland-magma device.

Test: ran virtmagma_unit_tests_linux
Change-Id: I7ff7925b0af4d52142d5cebe09229b5712ca6317
diff --git a/src/intel/vulkan/BUILD.gn b/src/intel/vulkan/BUILD.gn
index c05042b..e92dc56 100644
--- a/src/intel/vulkan/BUILD.gn
+++ b/src/intel/vulkan/BUILD.gn
@@ -87,7 +87,7 @@
 
   if (is_linux) {
     # TODO(MA-588): support flexible device path
-    defines = [ "DEV_GPU_PATH_OVERRIDE=\"/dev/wl0\"" ]
+    defines = [ "DEV_GPU_PATH_OVERRIDE=\"/dev/magma0\"" ]
   }
 
   public_configs = [ ":vulkan_internal_config" ]