layer.conf: set a variable to map to the OE Layer Index name
Add a variable that allows us to map the OE-Core layer to the name that
represents it in the OpenEmbedded layer index. This will be used by
bitbake-layers layerindex-fetch so that it knows that for example
OE-Core is already fetched and included in the current configuration.
Note - it won't be required for us to go around and set this for every
layer - we can do the matching based on repo and subdirectory, but
OE-Core is somewhat special in that it does sometimes appear in
different places, for example in poky.
[YOCTO #5348]
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
