loader: Add GetName and GetDescription for logs

Handy to have more layer detail for logging.

Change-Id: I6933a8fcb90b9cfb70fc85a358244863aac9d702
(cherry picked from commit cf275f37b4a903b5dcc95b5100db667c906aa33f)
diff --git a/vulkan/libvulkan/loader.h b/vulkan/libvulkan/loader.h
index 3e2d1c4..8d5a758 100644
--- a/vulkan/libvulkan/loader.h
+++ b/vulkan/libvulkan/loader.h
@@ -150,6 +150,9 @@
     LayerRef(const LayerRef&) = delete;
     LayerRef& operator=(const LayerRef&) = delete;
 
+    const char* GetName();
+    uint32_t GetSpecVersion();
+
     // provides bool-like behavior
     operator const Layer*() const { return layer_; }