classes/utils: Improve all_multilib_tune_values

Currently there is duplication in the code, we can clean this up
by extending the multilib variants list.

This code also currently fails its its called from an existing multilib
context since its assumes the data store passed in is the non-multilib
case. When building an image, say lib32-core-image-sato, this leads to
incorrect PATH values.

To fix this, we also request a data store for the "" variant allowing
this corner case to be fixed and for the function to correctly return
values for each multilib even when a multilib is already selected.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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