net: Use phys_addr_t for SMC net device addresses

Use same type as eth_device->iobase and support addresses greater
than INT_MAX.

Signed-off-by: Peter Hoyes <Peter.Hoyes@arm.com>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
diff --git a/drivers/net/smc91111.c b/drivers/net/smc91111.c
index ec4e8e9..61d7f3d 100644
--- a/drivers/net/smc91111.c
+++ b/drivers/net/smc91111.c
@@ -1269,7 +1269,7 @@
 }
 #endif
 
-int smc91111_initialize(u8 dev_num, int base_addr)
+int smc91111_initialize(u8 dev_num, phys_addr_t base_addr)
 {
 	struct smc91111_priv *priv;
 	struct eth_device *dev;