u-boot-fw-utils: Separate out legacy build for zynq
u-boot-fw-utils: Separate out legacy build for zynq

Since the xilinx-zynq targets are pulling the old 2012.10 branch,
the overridden do_compile(), do_install(), and LIC_FILES_CHECKSUM
need to be made MACHINE-specific overrides, otherwise they break
the sane inherrited recipe constructs that we're bbappending to
for targets that use the 2017 recipe from oe-core.

Signed-off-by: Brad Mouring <58d99a887450796456131638ba4c43b5ba95afcf@ni.com>

ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt