drm/rockchip: remove NR_LAYERS macro on vop2

There are 8 layers on rk3588, so a fix defined macro is
not appropriate.

Signed-off-by: Andy Yan <[e-mail]>
Reviewed-by: Sascha Hauer <[e-mail]>
Signed-off-by: Heiko Stuebner <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/rockchip/rockchip_drm_vop2.c

···
 	return NULL;
 }
 
-#define NR_LAYERS 6
-
 static int vop2_create_crtcs(struct vop2 *vop2)
 {
 	const struct vop2_data *vop2_data = vop2->data;
···
 		struct vop2_video_port *vp = &vop2->vps[i];
 
 		if (vp->crtc.port)
-			vp->nlayers = NR_LAYERS / nvps;
+			vp->nlayers = vop2_data->win_size / nvps;
 	}
 
 	return 0;