remove all status checks. only handle release.

the release variable is all we need, turning a target on
or off for a given release.

the status checks were prone to bugs, and unnecessary; it
also broke certain benchmark scripts.

it's better to keep the lbmk logic simpler. board status
will be moved to the documentation instead.

Signed-off-by: Leah Rowe <leah@libreboot.org>

config/coreboot/d510mo/target.cfg

@@ -4,5 +4,4 @@ payload_grub="n"
 payload_grub_withseabios="n"
 payload_seabios="y"
 payload_memtest="y"
-status="untested"
 release="n"

config/coreboot/d510mo/warn.txt

@@ -1 +0,0 @@
-this board has never been stable, and has not been tested in Libreboot 20240504 so no ROM images included for it in that release