Add plane setting to connector configuration
Provide a setting to override the default DRM plane
alloction for each connector in a lease.
DRM planes that are compatible with multiple CRTCs/
connectors can now be assigned to a lease by
explicity setting the connector that they belong to
in the configuration file.
This can also be used to restrict the planes that
are available to a given connector.
Bug-AGL: SPEC-3815
Change-Id: If4168fc3081213c4ed1df09755cadf042c68d9a3
Signed-off-by: Damian Hobson-Garcia <dhobsong@igel.co.jp>