Adjustment to LAN9512 reference schematics: pull ups for tx, rx, caps for emi, adjustments for the test pins, some minor changes;

Skew optimized;
Adds PoE filter caps;
Major Ground domain rework;
Minor adjustemnets

cm4-nrf54.kicad_prl

@@ -1,6 +1,6 @@
 {
   "board": {
-    "active_layer": 2,
+    "active_layer": 0,
     "active_layer_preset": "",
     "auto_track_width": false,
     "hidden_netclasses": [],
@@ -20,7 +20,7 @@
       "footprints": true,
       "graphics": true,
       "keepouts": true,
-      "lockedItems": true,
+      "lockedItems": false,
       "otherItems": true,
       "pads": true,
       "text": true,
@@ -49,7 +49,7 @@
       "conflict_shadows",
       "shapes"
     ],
-    "visible_layers": "00000000_00000000_00000008_a2002277",
+    "visible_layers": "ffffffff_ffffffff_fffffff5_ff555fef",
     "zone_display_mode": 1
   },
   "git": {