Rename `NetworkPcds` to `NetworkFixedPcds` to avoid confusion with
dynamic PCDs. The next patches in the chain will update all references
across the codebase to use the new name.
Cc: Saloni Kasbekar <saloni.kasbekar@intel.com>
Cc: Zachary Clark-williams <zachary.clark-williams@intel.com>
Signed-off-by: Aleksandr Goncharov <chat@joursoir.net>
Aleksandr Goncharov