New network drivers for the Kyu operating system

This work is starting with the Allwinner H5, but the Xilinx Zynq should follow close behind

• introduction
• Build U-boot from source
• U-boot FIT buffer bug
• ATF revisited
• Try Johang's SD-image boot setup
• Make a stripped down boot setup
• study the U-boot Makefile - part 1
• the U-boot Makefile - part 2 (bl31 and binman)