Remove insecure broadcom-sta driver from hardware profiles

The broadcom-sta driver package is marked as insecure due to CVE-2019-9501
and CVE-2019-9502 (heap buffer overflow vulnerabilities allowing remote code
execution). The driver is also unmaintained and incompatible with modern
Linux kernel security mitigations.

Removed broadcom_sta from extraModulePackages and the corresponding "wl" kernel module.

This resolves test failures where Nixpkgs refuses to evaluate configurations
containing this insecure package.

apple/macbook-pro/11-1/default.nix

@@ -6,9 +6,5 @@
     ../../../common/cpu/intel/haswell
   ];
 
-  # broadcom-wl
   hardware.enableRedistributableFirmware = lib.mkDefault true;
-  # nixos-generate-config doesn't detect this automatically.
-  boot.extraModulePackages = with config.boot.kernelPackages; [ broadcom_sta ];
-  boot.kernelModules = [ "wl" ];
 }