drm/xe: Delete xe_lrc_assert_ring_space

The WARN for ring space is bogus as the LRC head value can be stable relative to job signaling and the ring head value. This results in the DRM scheduler submitting jobs as it knows there is space in the ring via job signaling while the LRC reads a stale value which indicates the ring does not have space. Delete this assert.

Signed-off-by: Matthew Brost matthew.brost@intel.com