Replace ShortcutType with UserShortcutType to reduce duplicate
declaration.

- Replace AccessibilityManager.ACCESSIBILITY_BUTTON with
  ShortcutConstants.UserShortcutType.SOFTWARE
- Replace AccessibilityManager.ACCESSIBILITY_SHORTCUT_KEY with
  ShortcutConstants.UserShortcutType.HARDWARE

Bug: 317424693
Test: atest
Flag: N/A. Not able to flag the refactor
NO_IFTTT=New IFTTT tags

Change-Id: Ic67c2baac079429fe67a75ffd520f8b1738a1322
25 files changed