Add a vintf fragment for hwservicemanager

hwservicemanager serves android.hidl.manager and android.hidl.token. Now
that hwservicemanager is optional for devices that aren't using HIDL,
we add the framework manifest declarations of those interfaces to
hwservicemanager's vintf fragment.

Test: boot Cuttlefish with and without hwservicemanager installed
Bug: 218588089
Change-Id: Ic0c2dc22b89b9956671506d792ebe9520c6bd722
2 files changed