drm/i915/selftests: fix spelling mistake "submited" -> "submitted"

There is a spelling mistake in a pr_err message. Fix it.
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Reviewed-by: NChris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20200617085207.167552-1-colin.king@canonical.com

drivers/gpu/drm/i915/gt/selftest_lrc.c

@@ -482,7 +482,7 @@ static int live_unlite_ring(void *arg)
 		err = wait_for_submit(engine, rq, HZ / 2);
 		i915_request_put(rq);
 		if (err) {
-			pr_err("%s: preemption request was not submited\n",
+			pr_err("%s: preemption request was not submitted\n",
 			       engine->name);
 			err = -ETIME;
 		}