hdmi: disable 4K60Hz

refine follow patch,
    6d18cbc
    drm/rockchip: remove hdmi 4k@50hz/60hz mode rate

    Remove hdmi 4k@50hz/60hz till we pass VD
    and EMI testing.

To return out of range if clk is 594M to disable 4K60hz.

Change-Id: I13531ce35f00f2b43f23cc6304012c2958f6855f

Author: ck_zhang

drivers/gpu/drm/rockchip/rockchip_drm_vop.c

@@ -1494,6 +1494,9 @@ vop_crtc_mode_valid(struct drm_crtc *crtc, const struct drm_display_mode *mode,
 	const struct vop_data *vop_data = vop->data;
 	int clock;
 
+	if (mode->clock >= 594000)
+		return MODE_CLOCK_RANGE;
+
 	if (mode->hdisplay > vop_data->max_disably_output.width)
 		return MODE_BAD_HVALUE;
 	if (mode->vdisplay > vop_data->max_disably_output.height)