axs101: add U-Boot support

Signed-off-by: Alexey Brodkin <[email protected]>

Author: abrodkin

configs/axs101_defconfig

@@ -1,5 +1,4 @@
 BR2_arcle=y
-BR2_JLEVEL=5
 BR2_TOOLCHAIN_BUILDROOT_LARGEFILE=y
 BR2_TOOLCHAIN_BUILDROOT_INET_IPV6=y
 BR2_TOOLCHAIN_BUILDROOT_INET_RPC=y
@@ -30,3 +29,8 @@ BR2_PACKAGE_LIBUSB_COMPAT=y
 BR2_TARGET_ROOTFS_CPIO_LZO=y
 BR2_TARGET_ROOTFS_INITRAMFS=y
 # BR2_TARGET_ROOTFS_TAR is not set
+BR2_TARGET_UBOOT=y
+BR2_TARGET_UBOOT_BOARDNAME="axs101"
+BR2_TARGET_UBOOT_CUSTOM_GIT=y
+BR2_TARGET_UBOOT_CUSTOM_REPO_URL="https://github.com/foss-for-synopsys-dwc-arc-processors/u-boot.git"
+BR2_TARGET_UBOOT_CUSTOM_REPO_VERSION="071d18c86234c630e3c3810b6bbf7445282472c1"