drm/panel: panel-samsung-s6e3ha2: Use backlight power constants

Replace FB_BLANK_ constants with their counterparts from the
backlight subsystem. The values are identical, so there's no
change in functionality or semantics.

Signed-off-by: Thomas Zimmermann <[e-mail]>
Cc: Neil Armstrong <[e-mail]>
Cc: Jessica Zhang <[e-mail]>
Reviewed-by: Jessica Zhang <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/panel/panel-samsung-s6e3ha2.c

···
 		return -EINVAL;
 	}
 
-	if (bl_dev->props.power > FB_BLANK_NORMAL)
+	if (bl_dev->props.power > BACKLIGHT_POWER_REDUCED)
 		return -EPERM;
 
 	s6e3ha2_call_write_func(ret, s6e3ha2_test_key_on_f0(ctx));
···
 	s6e3ha2_call_write_func(ret, mipi_dsi_dcs_set_display_off(dsi));
 
 	msleep(40);
-	ctx->bl_dev->props.power = FB_BLANK_NORMAL;
+	ctx->bl_dev->props.power = BACKLIGHT_POWER_REDUCED;
 
 	return 0;
 }
···
 	if (ret < 0)
 		goto err;
 
-	ctx->bl_dev->props.power = FB_BLANK_NORMAL;
+	ctx->bl_dev->props.power = BACKLIGHT_POWER_REDUCED;
 
 	return 0;
 
···
 	s6e3ha2_call_write_func(ret, s6e3ha2_test_key_off_f0(ctx));
 
 	s6e3ha2_call_write_func(ret, mipi_dsi_dcs_set_display_on(dsi));
-	ctx->bl_dev->props.power = FB_BLANK_UNBLANK;
+	ctx->bl_dev->props.power = BACKLIGHT_POWER_ON;
 
 	return 0;
 }
···
 
 	ctx->bl_dev->props.max_brightness = S6E3HA2_MAX_BRIGHTNESS;
 	ctx->bl_dev->props.brightness = S6E3HA2_DEFAULT_BRIGHTNESS;
-	ctx->bl_dev->props.power = FB_BLANK_POWERDOWN;
+	ctx->bl_dev->props.power = BACKLIGHT_POWER_OFF;
 
 	drm_panel_init(&ctx->panel, dev, &s6e3ha2_drm_funcs,
 		       DRM_MODE_CONNECTOR_DSI);