drm/i915: Remove duplicate intel_logical_ring_workarounds_emit

intel_ring_workarounds_emit is exactly the same code.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/20170214150017.16058-1-tvrtko.ursulin@linux.intel.com