Add Microchip Icicle-kit board support.

* Uses Linux kernel released by Microchip
  - https://github.com/linux4microchip/linux.git
  - Ver: v5.15   Tag: linux4microchip+fpga-2023.02
* Uses UBoot released by Microchip
  - Ver: uboot-2022-01 Tag: linux4microchip+fpga-2023.02

To generate NixOS sd image for MICROCHIP icicle-kit refer:
  https://github.com/tiiuae/ghaf.git

Signed-off-by: Ganga Ram <Ganga.Ram@tii.ae>

microchip/common/bsp/hss-payload-generator.nix

@@ -0,0 +1,50 @@
+{ pkgs, ...}:
+with pkgs;
+stdenv.mkDerivation rec {
+  pname = "hss";
+  version = "v2022.09";
+
+  src = fetchFromGitHub {
+    owner = "polarfire-soc";
+    repo = "hart-software-services";
+    rev = version;
+    sha256 = "sha256-j/nda7//CjJW09zt/YrBy6h+q+VKE5t/ueXxDzwVWQ0=";
+  };
+
+  depsBuildBuild = [
+    buildPackages.stdenv.cc
+  ];
+
+  nativeBuildInputs = with buildPackages; [
+    libyaml
+    elfutils
+    openssl
+    zlib
+  ];
+
+  patchPhase = ''
+    runHook prePatch
+
+    substituteInPlace ./tools/hss-payload-generator/Makefile \
+      --replace "/bin/bash" "bash"
+
+    runHook postPatch
+  '';
+
+  buildPhase = ''
+    runHook preBuild
+
+    make -C ./tools/hss-payload-generator
+
+    runHook postBuild
+  '';
+
+  installPhase = ''
+    runHook preInstall
+
+    mkdir -p $out
+    cp ./tools/hss-payload-generator/hss-payload-generator $out
+
+    runHook postConfigure
+  '';
+}