mmc: core: changes frequency to hs_max_dtr when selecting hs400es

Per JESD84-B51 P49, Host need to change frequency to <=52MHz
after setting HS_TIMING to 0x1, and host may changes frequency
to <= 200MHz after setting HS_TIMING to 0x3. That means the card
expects the clock rate to increase from the current used f_init
(which is less than 400KHz, but still being less than 52MHz) to
52MHz, otherwise we find some eMMC devices significantly report
failure when sending status.

Reported-by: Xiao Yao <[e-mail]>
Signed-off-by: Shawn Lin <[e-mail]>
Reviewed-by: Douglas Anderson <[e-mail]>
Signed-off-by: Ulf Hansson <[e-mail]>

drivers/mmc/core/mmc.c

···
 	if (err)
 		goto out_err;
 
+	mmc_set_clock(host, card->ext_csd.hs_max_dtr);
+
 	err = mmc_switch_status(card);
 	if (err)
 		goto out_err;