usbsdmux: init at 0.1.8

Add the usbsdmux utility which is used to control the USB-SD-Mux
developed by the Linux Automation GmBH.

pkgs/development/tools/misc/usbsdmux/default.nix

···
+{ lib, python3Packages }:
+
+python3Packages.buildPythonApplication rec {
+  pname = "usbsdmux";
+  version = "0.1.8";
+
+  src = python3Packages.fetchPypi {
+    inherit pname version;
+    sha256 = "0m3d0rs9s5v5hnsjkfybmd8v54gn7rc1dbg5vc48rryhc969pr9f";
+  };
+
+  meta = with lib; {
+    description = "Control software for the LXA USB-SD-Mux";
+    homepage = "https://github.com/linux-automation/usbsdmux";
+    license = licenses.lgpl21;
+    maintainers = with maintainers; [ emantor ];
+    platforms = with platforms; linux;
+  };
+}

pkgs/top-level/all-packages.nix

···
   usb-modeswitch = callPackage ../development/tools/misc/usb-modeswitch { };
   usb-modeswitch-data = callPackage ../development/tools/misc/usb-modeswitch/data.nix { };
 
+  usbsdmux = callPackage ../development/tools/misc/usbsdmux { };
+
   anthy = callPackage ../tools/inputmethods/anthy { };
 
   evdevremapkeys = callPackage ../tools/inputmethods/evdevremapkeys { };