mmc: mediatek: perfer to use rise edge latching for cmd line

data lines have applied to perfer to use rise edge, also need
apply it to cmd line.
Signed-off-by: NChaotian Jing <chaotian.jing@mediatek.com>
Tested-by: NSean Wang <sean.wang@mediatek.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/mtk-sd.c

@@ -1550,7 +1550,8 @@ static int msdc_tune_response(struct mmc_host *mmc, u32 opcode)
 	}
 	final_rise_delay = get_best_delay(host, rise_delay);
 	/* if rising edge has enough margin, then do not scan falling edge */
-	if (final_rise_delay.maxlen >= 12 && final_rise_delay.start < 4)
+	if (final_rise_delay.maxlen >= 12 ||
+	    (final_rise_delay.start == 0 && final_rise_delay.maxlen >= 4))
 		goto skip_fall;
 
 	sdr_set_bits(host->base + MSDC_IOCON, MSDC_IOCON_RSPL);