net: gem: Use phys_addr_t instead of int for addresses

Use phys_addr_t for physical address declaration.
It is also unsigned type instead of sign.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/include/netdev.h b/include/netdev.h
index 34651ab..daffc12 100644
--- a/include/netdev.h
+++ b/include/netdev.h
@@ -93,7 +93,8 @@
 int xilinx_ll_temac_eth_init(bd_t *bis, unsigned long base_addr, int flags,
 						unsigned long ctrl_addr);
 int zynq_gem_of_init(const void *blob);
-int zynq_gem_initialize(bd_t *bis, int base_addr, int phy_addr, u32 emio);
+int zynq_gem_initialize(bd_t *bis, phys_addr_t base_addr,
+			int phy_addr, u32 emio);
 /*
  * As long as the Xilinx xps_ll_temac ethernet driver has not its own interface
  * exported by a public hader file, we need a global definition at this point.