Move about a dozen test files for U-Boot image variants (SPL, TPL,
VPL, DTB, nodtb, bss-pad) into an xpl/ subdirectory. Drop the
numeric prefixes and the redundant u_boot_ filename prefix, and
update all references.
Signed-off-by: Simon Glass <simon.glass@canonical.com>
Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de>
