BSC packages are no longer in bsc attribute

Reviewed-by: Aleix Roca Nonell <aleix.rocanonell@bsc.es>

m/common/main.nix

@@ -42,7 +42,7 @@
     nix-diff ipmitool freeipmi ethtool lm_sensors ix cmake gnumake file tree
     ncdu config.boot.kernelPackages.perf ldns
     # From bsckgs overlay
-    bsc.osumb
+    osumb
   ];
 
   programs.direnv.enable = true;

pkgs/overlay.nix

@@ -1,8 +1,7 @@
 final: prev:
 {
-  bsc = prev.bsc.extend (bscFinal: bscPrev: {
   # Set MPICH as default
-    mpi = bscFinal.mpich;
+  mpi = final.mpich;
 
   # Configure the network for MPICH
   mpich = with final; prev.mpich.overrideAttrs (old: {
@@ -24,7 +23,6 @@ final: prev:
       "FCFLAGS=-fallow-argument-mismatch"
     ];
   });
-  });
 
   # Update ceph to 18.2.0 until it lands in nixpkgs, see:
   # https://github.com/NixOS/nixpkgs/pull/247849