Add support for Olimex ESP32-POE-WROVER.

There is a version of the Olimex ESP32-POE board with an ESP32-WROVER
module which has a the ethernet clock connected to a different IO than
the version with an ESP32-WROOM module.

This commit adds a new runtime selectable variant for the WROVER version.

wled00/network.cpp

@@ -123,6 +123,16 @@ const ethernet_settings ethernetBoards[] = {
     18,                   // eth_mdio,
     ETH_PHY_LAN8720,      // eth_type,
     ETH_CLOCK_GPIO17_OUT  // eth_clk_mode
+  },
+
+  // ESP32-POE-WROVER
+  {
+    0,                    // eth_address,
+    12,                   // eth_power,
+    23,                   // eth_mdc,
+    18,                   // eth_mdio,
+    ETH_PHY_LAN8720,      // eth_type,
+    ETH_CLOCK_GPIO0_OUT   // eth_clk_mode
   }
 };
 #endif