Revoke the location permission properly after the emergency calls

There is a 2 second delay to unbind the in-call services after all the
calls are removed. If customize the delay to a longer value(eg:5s), and
make more than one emergency calls within the delay, then the location
permission won't be revoked.

When the delay of the first emergency call expires, it doesn't revoke
the permission because permission flag mHadFineLocation was wrongly
updated to true. When the delay of the second emergency call expires,
it also doesn't revoke the permission because permission flag
mLocationPermissionGrantedToUser was wrongly updated to null.

The change is to update the permission flags properly, and only keep
the latest delay timer to revoke the permission after all the calls
end.

Bug: 345386002
Test: manual
Test: atest InCallControllerTests
Test: atest EmergencyCallHelperTest
Change-Id: I1a451ea9a752f83f27ff1e65d05fc0fb52f75b84