Add support for U-Boot recipes to install and deploy the generated ELF
files for each config. The U-Boot ELF's are useful for debugging, and
booting (directly booting, e.g. by JTAG or using QEMU) and complement
the generated binary image.
This additional feature is disabled by default, machines/etc that want
to use it need to set UBOOT_ELF to the corresponding ELF file (generally
u-boot or u-boot.elf depending on the architecture)
Signed-off-by: Nathan Rossi <nathan@nathanrossi.com> Signed-off-by: Ross Burton <ross.burton@intel.com>
