mmc: set bus width to 1 and clock to minimum early during initialization

We need to switch back to 1-bit before initialization or SD 2.0 cards
will fail to send SCR if we've switched to 4-bit already.

Signed-off-by: Ilya Yanok <yanok@emcraft.com>

drivers/mmc/mmc.c

@@ -859,6 +859,9 @@ int mmc_init(struct mmc *mmc)
 	if (err)
 		return err;
 
+	mmc_set_bus_width(mmc, 1);
+	mmc_set_clock(mmc, 1);
+
 	/* Reset the Card */
 	err = mmc_go_idle(mmc);