Rename the new limited VDM role.

A more generic name is much better as it could still be used for
creating trusted displays and input injection in the future, not only
for sensors.

And make it non-self-managed.

Bug: 368633836
Test: presubmit
Flag: android.companion.virtualdevice.flags.enable_limited_vdm_role
Change-Id: Iaa73b23231aa8a0faba6605edb9a87abb8799475