mmc: Changed the datatype of the variable to handle 64-bit arch

This patch changed the datatype of variable "start" from uint to ulong
to work properly on 64-bit machines as well. Also the return type of
get_timer() function is ulong.

Signed-off-by: Vipul Kumar <vipul.kumar@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/drivers/mmc/sdhci.c b/drivers/mmc/sdhci.c
index 758850f..c2ae3e3 100644
--- a/drivers/mmc/sdhci.c
+++ b/drivers/mmc/sdhci.c
@@ -151,7 +151,7 @@
 	u32 mask, flags, mode;
 	unsigned int time = 0, start_addr = 0;
 	int mmc_dev = mmc_get_blk_desc(mmc)->devnum;
-	unsigned start = get_timer(0);
+	ulong start = get_timer(0);
 
 	/* Timeout unit - ms */
 	static unsigned int cmd_timeout = SDHCI_CMD_DEFAULT_TIMEOUT;