Support fbt for accessibilityValue

Summary: Changelog: [Internal] - Change accessibilityValue.text type to allow for Stringish type

Reviewed By: yungsters

Differential Revision: D31577860

fbshipit-source-id: af12505794037a68850a16ce139359e2f8a879e4

Libraries/Components/View/ViewAccessibility.js

@@ -85,5 +85,5 @@ export type AccessibilityValue = $ReadOnly<{|
   /**
    * A textual description of this component's value. (will override minimum, current, and maximum if set)
    */
-  text?: string,
+  text?: Stringish,
 |}>;