avionic design with actual uboot and tooling

submodule of avionic design uboot bootloader and with included tools to
get you started , read readme.md and readme-tk1-loader.md

u-boot/arch/arm/mach-tegra/tegra124/Makefile

@@ -0,0 +1,18 @@
+#
+# (C) Copyright 2013-2014
+# NVIDIA Corporation <www.nvidia.com>
+#
+# SPDX-License-Identifier:     GPL-2.0+
+#
+
+obj-$(CONFIG_SPL_BUILD) += cpu.o
+
+obj-y	+= clock.o
+obj-y	+= funcmux.o
+obj-y	+= pinmux.o
+obj-y	+= xusb-padctl.o
+obj-y	+= ../xusb-padctl-common.o
+
+ifndef CONFIG_SPL_BUILD
+obj-$(CONFIG_ARMV7_NONSEC) += psci.o
+endif