hal_tetheroffload: move hwservice mapping to core policy

Addresses:
avc: denied { find } for
interface=android.hardware.tetheroffload.config::IOffloadConfig
scontext=u:r:system_server:s0
tcontext=u:object_r:default_android_hwservice:s0
tclass=hwservice_manager

Bug: 77855688
Test: build/boot Sailfish, turn on tethering, no selinux denial
Change-Id: I97cae0928b5311a4da41d19cbd5c863c3137a49f

private/hwservice_contexts

@@ -43,6 +43,8 @@ android.hardware.renderscript::IDevice                          u:object_r:hal_r
 android.hardware.secure_element::ISecureElement                 u:object_r:hal_secure_element_hwservice:s0
 android.hardware.sensors::ISensors                              u:object_r:hal_sensors_hwservice:s0
 android.hardware.soundtrigger::ISoundTriggerHw                  u:object_r:hal_audio_hwservice:s0
+android.hardware.tetheroffload.config::IOffloadConfig           u:object_r:hal_tetheroffload_hwservice:s0
+android.hardware.tetheroffload.control::IOffloadControl         u:object_r:hal_tetheroffload_hwservice:s0
 android.hardware.thermal::IThermal                              u:object_r:hal_thermal_hwservice:s0
 android.hardware.thermal::IThermalCallback                      u:object_r:thermalcallback_hwservice:s0
 android.hardware.tv.cec::IHdmiCec                               u:object_r:hal_tv_cec_hwservice:s0