audio: Skip stream I/O test for "echo reference" input device

This is aligned with the HIDL implementation VTS. The echo reference
device can't provide any input until certain preconditions are met,
and modeling these preconditions in the test is not trivial.

Also, add the information into the mix port into the trace scope
for easier identification on test failure.

Bug: 328010709
Test: atest VtsHalAudioCoreTargetTest
(cherry picked from https://android-review.googlesource.com/q/commit:a62c5df181b37bb7a066cbd154cb13a59a596345)
Merged-In: I737479d8ef1961791ac3bd82aeb779453d2e49f4
Change-Id: I737479d8ef1961791ac3bd82aeb779453d2e49f4