For now, this layer is marked compatible with the Yocto version which PetaLinux
v2021.1 is based on (codename "gatesgarth"), only. Other version might be added
as needed (space separated). Incompatibilities with older versions are not known
at this point in time.
Signed-off-by: Joachim Foerster <joachim.foerster@missinglinkelectronics.com>