Show detail explaining why fg options are unavailable

If the app could have foreground capabilities, for example your
assistant, we disable the option for users to grant fg only because
these permsisions are still accessible in the background due to the
bind_include_capabilities flag.

Test: atest CtsPermission3TestCases
Bug: 153997991
Change-Id: I0c953da6ab4af9712ff1bf67e4ffb0a71e002829