Add check to not show PS unlock message when activity is recreated

The condition added with this change makes sure the toast message is
shown only once and to not show duplicate toast  evertime the activity
is recreated on screen rotation.

Recording link : b/324442522#comment2

Bug: 324442522
Test: Manual
Change-Id: I4e17384c1d02deacdd911195f014b0c8f1eb8833