virtualization/config: allow conditional use of yocto-cfg-fragments

To help enforce/guide consistent configuration and to avoid duplicating
configuration fragments into the meta-virt layer, we leverage a native
provider of the yocto-kernel-cache fragment repository.

To allow support for kernels that support fragments, but don't have the
yocto-kernel-cache in the kernel's SRC_URI, we create two conditional
parts of the virtualization configuration.

If virtualization is enabled in the distro features, the kernel
version matches one of our supported ones, and the kernel inherits
kernel-yocto, we add a depedency on the yocto-cfg-fragments-native
recipe.

That recipe will install the fragment collection to the kernel recipe's
native sysroot.

We can then check for the kernel-cache on the SRC_URI. If it is present,
we use the feature at the standard location. If it is not present, we
add the fragment from the native sysroot.

While we could always use the native sysroot variant, we want to allow
a kernel with a kernel-cache to be the first choice, and provide their
own fragments.

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>

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