Add falsing to undo button

Add falsing to undo button in Media TTT view for sender.
When it appears on lock screen, we prevent unintended taps by user.
Delayed the creation of Falsing Manager to overcome the regression issue
happened in ag/19584050.

Bug: 244330924
Bug: 236956557
Test: atest MediaTttChipControllerSenderTest
Change-Id: I4d65d9a4c1e9d94a7720615be9d3a9693e04efd5