[fuchsia] Use //src/graphics/lib/vulkan for in-tree build

Change-Id: Ifd4f0f9e91377f543393cfb2e26f9d21ce807d2f
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/225417
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Craig Stout <cstout@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
Auto-Submit: Craig Stout <cstout@google.com>

BUILD.gn

@@ -633,7 +633,7 @@ optional("gpu") {
         public_deps += [ "$fuchsia_sdk_root/pkg:vulkan" ]
       } else {
         public_deps +=
-            [ "//third_party/vulkan_loader_and_validation_layers:vulkan" ]
+            [ "//src/graphics/lib/vulkan" ]
       }
     }
   }