Assign local device portId 0

Before, the local device on a TV would be assigned an invalid portId,
which was causing the local device to be removed from the HdmiCecNetwork
in some instances.

Bug: 213423171
Test: atest HdmiCecNetworkTest
Change-Id: I99e1ca1d54a74682c0737deb2ad2163f7db5e0db
Merged-In: I99e1ca1d54a74682c0737deb2ad2163f7db5e0db
2 files changed