Revert vc4/panel_cwu50 to boot.kernelModules (stage-2 loading)

Loading via boot.kernelModules ensures they're loaded after
initrd, by which time RP1 PCIe southbridge is initialized (~12s).
This avoids the 'Cannot find any crtc' error from premature probe.

- boot.kernelModules: explicit vc4 + panel_cwu50 (stage-2)
- boot.initrd.kernelModules: only ocp8178_bl (backlight)

hosts/uConsole/configuration.nix

@@ -181,13 +181,16 @@ in
     "rtl8xxxu"        # RTL8188/8192/8723 USB WiFi
     "rtl2832_sdr"     # RTL-SDR kernel module
     "dvb_usb_rtl28xxu" # RTL-SDR DVB-T
+    # Display drivers — loaded in stage-2 AFTER RP1 PCIe ready (~12s)
+    # NOT in initrd — RP1 southbridge isn't initialized yet
+    "panel_cwu50"     # uConsole DSI panel driver
+    "vc4"             # VideoCore 4 KMS GPU driver
   ];
 
   boot.blacklistedKernelModules = [ ];
 
-  # Rex-style: vc4/panel_cwu50 NOT loaded in initrd or forced
-  # udev auto-loads them when RP1 PCIe southbridge is ready (~12s)
-  # This avoids "Cannot find any crtc" from premature probe
+  # Rex-style: Rien dans initrd pour le display
+  # ocp8178_bl (backlight) chargé ici car indépendant de RP1
   boot.initrd.kernelModules = lib.mkForce [ "ocp8178_bl" ];
 
   # ============================================================