AccessibilityLabel is optional

Summary:
We have a bunch of components internally that use accessibilityLabel in invalid ways.
View was originally typed as any so invalid usages weren't caught. In order to fix these we have to move forward with getting back to flow having no errors. We are weakening these types to get there and we can tighten them again later.

Reviewed By: yungsters

Differential Revision: D7203260

fbshipit-source-id: 2282eba14899c620de5b4b1c1b2670b157f2fc9e

Libraries/Components/View/ViewPropTypes.js

@@ -46,7 +46,7 @@ export type ViewLayoutEvent = {
 // so we must include TVViewProps
 export type ViewProps = {
   accessible?: bool,
-  accessibilityLabel?: React$PropType$Primitive<any>,
+  accessibilityLabel?: null | React$PropType$Primitive<any> | string | Array<any> | any,
   accessibilityActions?: Array<string>,
   accessibilityComponentType?: AccessibilityComponentType,
   accessibilityLiveRegion?: 'none' | 'polite' | 'assertive',