Unload brcmfmac_wcc (if loaded) before brcmfmac (#1200)

Module brcmfmac cannot be unloaded with rmmod when brcmfmac_wcc is loaded.
This leads brcmfmac to crash on wake up.

Co-authored-by: Jörg Thalheim <[email protected]>

Author: kpy3

apple/macbook-pro/12-1/default.nix

@@ -16,7 +16,10 @@
     # https://bugzilla.kernel.org/show_bug.cgi?id=101681#c116.
     # Also brcmfmac could randomly crash on resume from sleep.
     powerUpCommands = lib.mkBefore "${pkgs.kmod}/bin/modprobe brcmfmac";
-    powerDownCommands = lib.mkBefore "${pkgs.kmod}/bin/rmmod brcmfmac";
+    powerDownCommands = lib.mkBefore ''
+      ${pkgs.kmod}/bin/rmmod -f -v brcmfmac_wcc 2>/dev/null || true
+      ${pkgs.kmod}/bin/rmmod brcmfmac
+      '';
   };
 
   # USB subsystem wakes up MBP right after suspend unless we disable it.