Expose scrollEnabled as iOS prop for TextInput (#20719)

Summary:
Pull Request resolved: #20719

Expose scrollEnabled as iOS prop for TextInput

Reviewed By: mmmulani

Differential Revision: D9383477

fbshipit-source-id: 7e803767f6b2fafceac932fecd9dd59dc6ab5295

Author: Chun Chen

Libraries/Components/TextInput/TextInput.js

@@ -156,6 +156,7 @@ type IOSProps = $ReadOnly<{|
     | 'username'
     | 'password'
   ),
+  scrollEnabled?: ?boolean,
 |}>;
 
 type AndroidProps = $ReadOnly<{|