mmc: dw_mmc-rockchip: Just set default sample value for legacy mode

.set_ios() is called from .resume() as well. For SDIO device which sets
keep-power-in-suspend, nothing should be changed after resuming, as well
as sample tuning value, since this value is tuned already. So we should
not overwrite it with the default value.

Change-Id: I18974f28d7a2253fd151817a5a3e4105c2e976b3
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>

Author: shawn1221

drivers/mmc/host/dw_mmc-rockchip.c

@@ -76,7 +76,7 @@ static void dw_mci_rk3288_set_ios(struct dw_mci *host, struct mmc_ios *ios)
 	}
 
 	/* Make sure we use phases which we can enumerate with */
-	if (!IS_ERR(priv->sample_clk))
+	if (!IS_ERR(priv->sample_clk) && ios->timing <= MMC_TIMING_SD_HS)
 		clk_set_phase(priv->sample_clk, priv->default_sample_phase);
 }