meta-alchemy: Set DISTRO_CODENAME to Alchemy-Thud
meta-alchemy: Set DISTRO_CODENAME to Alchemy-Thud

This fixes the issue that the parameter "Codename" was missing
when calling "lsbrelease -c" or "lsbrelease -a".

Signed-off-by: Joerg Hofrichter <64f05fd09614173ff715799ea05b4b0d8fbec0da@ni.com>

EttusResearch/meta-ettus,EttusResearch/meta-ettus,EttusResearch/meta-ettus,EttusResearch/meta-ettus,EttusResearch/meta-ettus,EttusResearch/meta-ettus