vts: hostapd: Remove optional service registration

Wifi VendorHAL is optional for Soft AP mode to function.
Tests should be runnable even on devices without VendorHAL.

Test: run vts -m VtsHalWifiHostapdV1_1Target
Bug: 148907288

Signed-off-by: Oleh Cherpak <oleh.cherpak@globallogic.com>
Change-Id: Id65d09d39d93e540a24e58fda233fd2faf8c3258