docker: add Analog Devices tools to docker image

docker: add Analog Devices tools to docker image

The boot ROM on Analog Devices ADSP-SC5xx SoCs requires code packaged
in the LDR format. Normally this is available as part of
our yocto-derived toolchain but, it is not a part of any other pre-made
toolchain anymore, so it is otherwise unavailable in the docker image
for CI. This patch adds a source build from the ADI maintained github
repository. In the future, a package available for install via apt will
be available, but currently there is no arm64 build upstream, so we must
build from source for the time being to support CI on both amd64 and
arm64 runners. The same ldr tool is used for arm and arm64 for all of
our boards with names adjusted to match the expected $(CROSS_COMPILE)
for these boards.

Signed-off-by: Greg Malysa <malysagreg@gmail.com>