drm/i915/gt: fix spelling mistake "evalution" -> "evaluation"

There is a spelling mistaking in a pr_notice 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/20200428084920.1035125-1-colin.king@canonical.com

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

@@ -282,7 +282,7 @@ int live_rps_clock_interval(void *arg)
 						  GEN6_RP_CUR_UP_EI),
 			     10)) {
 			/* Just skip the test; assume lack of HW support */
-			pr_notice("%s: rps evalution interval not ticking\n",
+			pr_notice("%s: rps evaluation interval not ticking\n",
 				  engine->name);
 			err = -ENODEV;
 		} else {