[automerge] Create callback to call on auxiliary supplicant events, namely 2p:...

[automerge] Create callback to call on auxiliary supplicant events, namely 2p: 832cfea9 2p: 9c8f8d85

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/interfaces/+/16941007

Bug: 165342942
Change-Id: I928895c12999379e5284ee0878d9402f3e3c08ea