Revert "Add property for apps to request support for showing multi-instance entry points"

This reverts commit 246ee62f.

Reason for revert: Potential culprit for b/318793851  - verifying through ABTD before revert submission. This is part of the standard investigation process, and does not mean your CL will be reverted.

Change-Id: I223e49ddd7862e49cabecd06a9a675f2b7eec1d1