beckham: sepolicy: Update for IMotVibrator hwservice

* Define the hal, but label only enough to appease ModServce.

Change-Id: Ie5a459a2fde575361ddf4ebc0c47c98988350aeb

sepolicy-mods/vendor/hwservice.te

 type hal_modmanager_hwservice, hwservice_manager_type;
+type hal_motvibrator_hwservice, hwservice_manager_type;
 

sepolicy-mods/vendor/hwservice_contexts

 com.motorola.mod::IModManager                               u:object_r:hal_modmanager_hwservice:s0
+motorola.hardware.vibrator::IMotVibrator                    u:object_r:hal_motvibrator_hwservice:s0
 

sepolicy-mods/vendor/system_app.te

 add_hwservice(system_app, hal_modmanager_hwservice)
+add_hwservice(system_app, hal_motvibrator_hwservice)
 allow system_app mods_service:service_manager find;
 allow system_app mods_service:service_manager add;