Add API to disallow entering PiP when launching a new activity

- Use this API when launching the camera from a double tap gesture where
  the user expects the camera to start for immediate use.
- Fix missing case of restoring the enter pip state.

Bug: 63916952
Test: Double tap to launch the camera, and ensure it does not trigger
      the current activity to enter PiP (if it supports it)

Change-Id: I2acf44984bcc57dff75701d0e9cbd6b798a97cd8