Fix PIC32 MAC initialization call (#1350)

Pass the NetworkInterface_t pointer through to StartInitMac. The
helper already requires the interface and uses it to iterate endpoints,
so the PIC32 network interface currently fails to compile.

Co-authored-by: aineoae86-sys <ai.neo.ae86@gmail.com>

Author: Old-Ding

source/portable/NetworkInterface/pic32mzef/NetworkInterface_eth.c

@@ -266,7 +266,7 @@
         if( xMacInitStatus == eMACInit )
         {
             /* This is the first time this function is called. */
-            if( StartInitMac() != false )
+            if( StartInitMac( pxInterface ) != false )
             {
                 /* Indicate that the MAC initialisation succeeded. */
                 xMacInitStatus = eMACPass;