mmc: dw_mmc: reduce timeout detection cycle

It's no need to speed 10 seconds to wait the mmc device out from busy
status. 500 milliseconds enough.

Signed-off-by: Ziyuan Xu <xzy.xu@rock-chips.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
Tested-by: Jaehoon Chung <jh80.chung@samsung.com>

drivers/mmc/dw_mmc.c

@@ -195,7 +195,7 @@ static int dwmci_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd,
 	ALLOC_CACHE_ALIGN_BUFFER(struct dwmci_idmac, cur_idmac,
 				 data ? DIV_ROUND_UP(data->blocks, 8) : 0);
 	int ret = 0, flags = 0, i;
-	unsigned int timeout = 100000;
+	unsigned int timeout = 500;
 	u32 retry = 100000;
 	u32 mask, ctrl;
 	ulong start = get_timer(0);