Cleanup unused deprecated syntax enforcement opt-out for react-native

Summary: Changelog: [Internal]

Differential Revision: D110600695

Author: SamChou19815

.flowconfig

@@ -64,11 +64,6 @@ module.system.haste.module_ref_prefix=m#
 
 react.runtime=automatic
 
-experimental.deprecated_utilities.excludes=<PROJECT_ROOT>/packages/react-native/Libraries/Renderer/shims/ReactNativeTypes.js
-experimental.deprecated_utilities.excludes=<PROJECT_ROOT>/packages/react-native/Libraries/Renderer/shims/ReactNativeViewConfigRegistry.js
-experimental.deprecated_colon_extends.excludes=<PROJECT_ROOT>/packages/react-native/Libraries/Renderer/shims/ReactNativeTypes.js
-experimental.deprecated_variance_sigils.excludes=<PROJECT_ROOT>/packages/react-native/Libraries/Renderer/shims/ReactNativeTypes.js
-
 ban_spread_key_props=true
 
 [lints]