bluez5: Unify bt_register_profile_* into a single function

bluez5: Unify bt_register_profile_* into a single function

It was a cause of confusion for little gain to have separate
functions for registering profiles with extra information, for
example "role" and "features". We remove those helper functions
in favor of a single one with more parameters, "role" and
"feature" when NULL, will be ignored.