Revert "wifidisplay: restrict broadcast by the proper permission"

This reverts commit fd8b6dab.

Reason for revert: Remove from July 2021 Android Security Bulletin due to break existing applications.

Bug: 176541017
Change-Id: I2acdeac519b001e6663b989a1e2adbcd3537d02e
Test: install WFD application and check whether it works normally.