phylib: change bsp machine search path
phylib: change bsp machine search path

Instead of parsing only machines from meta-phytec, we parse all
machine.conf files in all layers. We do this to be able to use the 'soc'
and 'supported_builds' manifest filter in ksp projects.

Signed-off-by: Stefan Müller-Klieser <a3e08e35e4a42be768e7d0e76ae1ba321c2a66dd@phytec.de>

PHYTEC-Messtechnik-GmbH/meta-phytec,PHYTEC-Messtechnik-GmbH/meta-phytec,PHYTEC-Messtechnik-GmbH/meta-phytec,PHYTEC-Messtechnik-GmbH/meta-phytec,PHYTEC-Messtechnik-GmbH/meta-phytec