ivsc-firmware: add a1_prod symbolic links to fix ipu6 webcams (#295508)

Closes #281373

pkgs/os-specific/linux/firmware/ivsc-firmware/default.nix

···
     cp --no-preserve=mode --recursive ./firmware/* $out/lib/firmware/vsc/
     install -D ./LICENSE $out/share/doc
 
+    mkdir -p $out/lib/firmware/vsc/soc_a1_prod
+    # According to Intel's documentation for prod platform the a1_prod postfix is need it (https://github.com/intel/ivsc-firmware)
+    # This fixes ipu6 webcams
+    for file in $out/lib/firmware/vsc/*.bin; do
+      ln -sf "$file" "$out/lib/firmware/vsc/soc_a1_prod/$(basename "$file" .bin)_a1_prod.bin"
+    done
+
     runHook postInstall
   '';