drm/i915/huc: Simplify intel_huc_init_hw()

On last guc/huc cleanup series we've simplified guc init hw
function but missed the one for the huc. While here, change
its signature as we don't care about huc loading status.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
Cc: Arkadiusz Hiler <arkadiusz.hiler@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170331115709.181940-1-michal.wajdeczko@intel.com