Fix the GAR issue of Switch Access user can not move the FAB to the edge to hide it in half.

Root cause:
Not set and export the corresponding Accessibility actions.

Solution:
Add two Accessibility actions related to move to the edge to hide and
move out the edge to show.

Bug: 184597649
Test: atest AccessibilityFloatingMenuViewTest
Change-Id: Icd98087d6c43f07ba2b8ec7050386a0573938dd9
4 files changed