multi-kernel.inc: improve handling of configs with different version string
multi-kernel.inc: improve handling of configs with different version string

Signed-off-by: Denys Dmytriyenko <d29de71aea38aad3a87d486929cb0aad173ae612@ti.com>

RedFIR/meta-ti,rcn-ee/meta-ti,joelagnel/meta-ti,joelagnel/meta-ti,RedFIR/meta-ti,RedFIR/meta-ti,rcn-ee/meta-ti,rcn-ee/meta-ti,joelagnel/meta-ti,RedFIR/meta-ti,joelagnel/meta-ti,rcn-ee/meta-ti