mmc: increase delay between ACMD41 retries

In the SD Specification, Power Up Diagram of Card figure, the Timeout
value for initialization process (ACMD41 command retries) is 1 second.
Align to match MMC cards (in mmc_send_op_cond()) and Linux kernel code,
and set the delay between ACMD41 command retries to 10ms.

Change-Id: I2e07cb9944e7d7b72f2d4b13e0505e6751458091
Signed-off-by: Yann Gautier <yann.gautier@st.com>

drivers/mmc/mmc.c

@@ -361,7 +361,7 @@ static int sd_send_op_cond(void)
 			return 0;
 		}
 
-		mdelay(1);
+		mdelay(10);
 	}
 
 	ERROR("ACMD41 failed after %d retries\n", SEND_OP_COND_MAX_RETRIES);