Allow VR State Listeners with RESTRICTED_VR_ACCESS permission.

Extend the ability to use VrStateListeners to applications that
have RESTRICTED_VR_ACCESS permission.  Previously, it required
ACCESS_VR_MANAGER only.

Add VrStateCallback object and methods to VrManager to access the
functionality outside of frameworks.

Bug: 64360244
Test: Manual. Tested ability from VrCore.

Change-Id: I01f1c75b1ccd44a09364df84218168cf6caab322