Fix/suppress google-explicit-constructor warnings

* Use NOLINT or NOLINTNEXTLINE to suppress warnings on intended converters

Bug: 28341362
Test: make with WITH_TIDY=1 DEFAULT_GLOBAL_TIDY_CHECKS=-*,google-explicit-constructor
Change-Id: I5c73437ecee0d672863664cc8c2970b099597f77
diff --git a/vulkan/libvulkan/layers_extensions.h b/vulkan/libvulkan/layers_extensions.h
index 1dae456..9e2ff5b 100644
--- a/vulkan/libvulkan/layers_extensions.h
+++ b/vulkan/libvulkan/layers_extensions.h
@@ -33,6 +33,7 @@
     LayerRef& operator=(const LayerRef&) = delete;
 
     // provides bool-like behavior
+    // NOLINTNEXTLINE(google-explicit-constructor)
     operator const Layer*() const { return layer_; }
 
     PFN_vkGetInstanceProcAddr GetGetInstanceProcAddr() const;