armTrustedFirmware*: fix hash

Either this was republished with another hash, or the hash was wrong
before all ready. Now I'm able to fetch and build it :-)

pkgs/misc/arm-trusted-firmware/default.nix

@@ -17,7 +17,7 @@ let
       owner = "ARM-software";
       repo = "arm-trusted-firmware";
       rev = "v${version}";
-      sha256 = "sha256-qfzZ3aVYYn0ZcZgKcLdB13B+eweDebLSBA3HTqdPdv0=";
+      sha256 = "0w3blkqgmyb5bahlp04hmh8abrflbzy0qg83kmj1x9nv4mw66f3b";
     };
 
     depsBuildBuild = [ buildPackages.stdenv.cc ];