mmc: sdhci-esdhc-imx: Add HS400 support for i.MX6SLL

i.MX6SLL support MMC up to V5.0, which means support HS400 mode.
Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/1589527703-19108-1-git-send-email-haibo.chen@nxp.comSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/sdhci-esdhc-imx.c

@@ -215,6 +215,7 @@ static const struct esdhc_soc_data usdhc_imx6sl_data = {
 static const struct esdhc_soc_data usdhc_imx6sll_data = {
 	.flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_STD_TUNING
 			| ESDHC_FLAG_HAVE_CAP1 | ESDHC_FLAG_HS200
+			| ESDHC_FLAG_HS400
 			| ESDHC_FLAG_STATE_LOST_IN_LPMODE,
 };