added xilinx lwip drivers, outgoing is working incoming TODO

bsp_z7/lwip/netif/topology.c

@@ -0,0 +1,37 @@
+#include "netif/xtopology.h"
+
+// struct xtopology_t {
+// 	UINTPTR emac_baseaddr;
+// 	enum xemac_types emac_type;
+// #ifndef SDT
+// 	UINTPTR intc_baseaddr;
+// 	unsigned intc_emac_intr;	/* valid only for xemac_type_xps_emaclite */
+// 	UINTPTR scugic_baseaddr; /* valid only for Zynq */
+// 	unsigned scugic_emac_intr; /* valid only for GEM */
+// #endif
+// };
+
+
+int xtopology_n_emacs = 2;
+struct xtopology_t xtopology[] = {
+    {
+        0xE000B000,
+        xemac_type_emacps,
+#ifndef SDT
+        0,
+        0,
+        0xF8F00100,
+        0x36
+#endif
+    },
+    {
+        0xE000C000,
+        xemac_type_emacps,
+#ifndef SDT
+        0,
+        0,
+        0xF8F00100,
+        0x4D
+#endif
+    }
+};