[SRU focal:linux-oem-5.6 focal:linux-oem-5.10] LP#1905013 -- express oem flavour explicitly V2

[Andy Whitcroft]

All kernels have an intrisic flavour (generic, lowlatency, aws, oem etc).
These are normally expressed in the binary package names from the
primary package, and reflected into the meta packages names produced by
linux-meta and linux-restricted-modules.  The flavours are further
qualified via the variants system.

For the linux-oem-{5.6,5.10} packages the intrisic flavour is missing
and is supplied via the variant.  This is wrong as we could never have
a second flavour in this package.  This is incompatible with generating
the package from the flavour names, as it does not have an intrinsic
flavour.  Express the oem flavour explcitly for these packages.

There are three sets of patches.  The first patch is for
kernel-series.yaml and corrects the variants there.  The next two
patches are for linux-meta-oem-5.6 and linux-restricted-modules-5.10,
and the final two are for linux-meta-oem-5.10 and linux-meta-oem-5.10.

I have compared the debian/control files before and after these updates
and they are identicle.

It should be safe to apply the variants update to kteam-tools as soon as
the remainder of the patches have been applied to the various branches,
they do not need to be uploaded.

-apw