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/mmc.c b/drivers/mmc/mmc.c
index a08c6947..3cfe6bf 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -679,7 +679,7 @@
 {
 	struct mmc_cmd cmd;
 	int timeout = 1000;
-	uint start;
+	ulong start;
 	int err;
 
 	mmc->op_cond_pending = 0;
@@ -2611,7 +2611,7 @@
 int mmc_init(struct mmc *mmc)
 {
 	int err = 0;
-	__maybe_unused unsigned start;
+	__maybe_unused ulong start;
 #if CONFIG_IS_ENABLED(DM_MMC)
 	struct mmc_uclass_priv *upriv = dev_get_uclass_priv(mmc->dev);