HDMICEC: Add equals test for ActiveSource

Add an equality test for the nested class ActiveSource in
HdmiCecLocalDevice.

Bug: 168713324
Test: atest HdmiCecLocalDeviceTest#testEqualsActiveSource
Change-Id: I1312004c3a91d8638033c9bb815f3dd61eb3f8cc
Merged-In: I1312004c3a91d8638033c9bb815f3dd61eb3f8cc
2 files changed