Fix talkback did not speak out ReplacementSpan's content description.

* setContentDescription() back to ReplacementSpan when receiving parcel
* extend writeToParcel to handle AccessibilityReplacementSpan

Bug: 155833272
Test: atest AccessibilityNodeInfoTest#testSetTextWithImageSpan_shouldTextSetToInfo
Change-Id: Iab902bdcee53fc09cbba2c7c06858823524a3af9
2 files changed