Move about 30 test files for FDT update, fdtmap, DTB compression,
alternates, and bootph into an fdt/ subdirectory. Drop the numeric
prefixes and the redundant fdt_ filename prefix, and update all
references.
Remove the unused no_alt_format.dts which has no references in any
test.
Signed-off-by: Simon Glass <simon.glass@canonical.com>
Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de>