drm/panthor: Fix spelling mistake "readyness" -> "readiness"

There is a spelling mistake in a drm_err message. Fix it.
Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Acked-by: Liviu Dudau <liviu.dudau@arm.com>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240326100219.43989-1-colin.i.king@gmail.com

drivers/gpu/drm/panthor/panthor_gpu.c

@@ -333,7 +333,7 @@ int panthor_gpu_block_power_on(struct panthor_device *ptdev,
 						 val, (mask32 & val) == mask32,
 						 100, timeout_us);
 		if (ret) {
-			drm_err(&ptdev->base, "timeout waiting on %s:%llx readyness",
+			drm_err(&ptdev->base, "timeout waiting on %s:%llx readiness",
 				blk_name, mask);
 			return ret;
 		}