angstrom.inc: don't hard-depend on meta-efl layer
angstrom.inc: don't hard-depend on meta-efl layer

Allows building a minimal stack of layers - oe-core/bsp/meta-oe/meta-angstrom

Signed-off-by: Denys Dmytriyenko <d29de71aea38aad3a87d486929cb0aad173ae612@ti.com>
Signed-off-by: Koen Kooi <42e3d96910f922bdd7dd1805fe3f8aff634f391d@dominion.thruhere.net>

Angstrom-distribution/meta-angstrom,martiert/meta-atto,pompomJuice/meta-angstrom,kraj/meta-angstrom,Angstrom-distribution/meta-angstrom,kraj/meta-angstrom,schnitzeltony/meta-angstrom,pompomJuice/meta-angstrom,Angstrom-distribution/meta-angstrom,schnitzeltony/meta-angstrom,kraj/meta-angstrom,martiert/meta-atto,martiert/meta-atto,schnitzeltony/meta-angstrom,pompomJuice/meta-angstrom,Angstrom-distribution/meta-angstrom,martiert/meta-atto