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/linux-icicle-kit.nix

@@ -0,0 +1,69 @@
+{ pkgs, ... } @ args:
+
+with pkgs;
+
+buildLinux (args // rec {
+  version = "5.15.92-linux4microchip+fpga-2023.02";
+
+  # modDirVersion needs to be x.y.z, will automatically add .0 if needed
+  modDirVersion = version;
+
+  defconfig = "mpfs_defconfig";
+
+  kernelPatches = [
+  ];
+
+  autoModules = false;
+
+  extraConfig = ''
+    OF_OVERLAY y
+    OF_CONFIGFS y
+    MFD_SENSEHAT_CORE m
+    INPUT_JOYDEV m
+    INPUT_JOYSTICK y
+    JOYSTICK_SENSEHAT m
+    AUXDISPLAY y
+    SENSEHAT_DISPLAY m
+    HTS221 m
+    IIO_ST_PRESS m
+    IIO_ST_LSM6DSX m
+    IIO_ST_MAGN_3AXIS m
+    POLARFIRE_SOC_DMA_NONCOHERENT y
+    MTD_SPI_NOR_USE_4K_SECTORS n
+    MTD_UBI y
+    MTD_CMDLINE_PARTS y
+    UBIFS_FS y
+    USB_UAS m
+    CRYPTO_TLS m
+    TLS y
+    MD y
+    BLK_DEV_MD m
+    MD_AUTODETECT y
+    MD_RAID0 m
+    MD_RAID1 m
+    MD_RAID10 m
+    MD_RAID456 m
+    DM_VERITY m
+    LOGO y
+    FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER n
+    FB_EFI n
+    EFI_STUB y
+    EFI y
+    VIRTIO y
+    VIRTIO_PCI y
+    VIRTIO_BLK y
+    DRM_VIRTIO_GPU y
+    EXT4_FS y
+    USBIP_CORE m
+    USBIP_VHCI_HCD m
+    USBIP_HOST m
+    USBIP_VUDC m
+  '';
+
+  src = fetchFromGitHub {
+    owner = "linux4microchip";
+    repo = "linux";
+    rev = "360a547daec2a69169be49d3da9cca8b1ecb325f";
+    sha256 = "sha256-ri2d91bHmcFkV2PjwRNho1XQixKttJKoG/qiOdeB01M=";
+  };
+} // (args.argsOverride or { }))