stop adding implicit provider configs

Now that providers in the graph can adopt resources without an explicit
provider, there's no need to add the implicit configs to the module.Tree
when loading.

config/module/tree.go

@@ -365,50 +365,6 @@ func (t *Tree) inheritProviderConfigs(stack []*Tree) {
 		}
 	}
 
-	// Search for implicit provider configs
-	// This adds an empty config is no inherited config is found, so that
-	// there is always a provider config present.
-	// This is done in the root module as well, just to set the providers.
-	for missing := range missingProviders {
-		// first create an empty provider config
-		pc := &config.ProviderConfig{
-			Name: missing,
-		}
-
-		// walk up the stack looking for matching providers
-		for i := len(stack) - 2; i >= 0; i-- {
-			pt := stack[i]
-			var parentProvider *config.ProviderConfig
-			for _, p := range pt.config.ProviderConfigs {
-				if p.FullName() == missing {
-					parentProvider = p
-					break
-				}
-			}
-
-			if parentProvider == nil {
-				continue
-			}
-
-			pc.Path = pt.Path()
-			pc.Path = append([]string{RootName}, pt.path...)
-			pc.RawConfig = parentProvider.RawConfig
-			pc.Inherited = true
-			log.Printf("[TRACE] provider %q inheriting config from %q",
-				strings.Join(append(t.Path(), pc.FullName()), "."),
-				strings.Join(append(pt.Path(), parentProvider.FullName()), "."),
-			)
-			break
-		}
-
-		// always set a provider config
-		if pc.RawConfig == nil {
-			pc.RawConfig, _ = config.NewRawConfig(map[string]interface{}{})
-		}
-
-		t.config.ProviderConfigs = append(t.config.ProviderConfigs, pc)
-	}
-
 	// After allowing the empty implicit configs to be created in root, there's nothing left to inherit
 	if len(stack) == 1 {
 		return