DEPL — For ExternalReferneceEndpoint add optional port name attribute

For ExternalReferneceEndpoint add optional port name attribute to
indicate the port that is used to connect to or to retrieve an interface
from the ExternalReferenceEndpoint. Rationale for change is to allow for
components to be connected to ExternalReferenceEndpoint that are
components. An example is a SWRadio use case for an I/O device resident in
the SWRadio, where the I/O Device has required and provider ports.

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