Remove updateShortcutVisibility

ShortcutManager#updateShortcutVisiblity was a new api intended for S,
due to the recent rollback of shortcut-appsearch integration, this api
can no longer be backed up AppSearch#VisibilityStore. To minimize the
risk of S release we should removed it from public api as opposed to
creating an alternative implementation.

Bug: 185828535, 185177108
Test: manual
Change-Id: Ic9d18237a25b11975f5859836877b9f77e25cc61