ANDROID: filter USD events for mainline supplicant

Mainline supplicant should ignore most events to avoid affecting normal
operation of the primary vendor supplicant. Allow only USD-relevant
event processing on mainline.

Bug: 365585450
Test: Ran vendor supplicant and mainline supplicant at the same time,
connected to wifi network, no more constant connection drops.

Change-Id: I9a80628d8040193ce4078d45afe6e6ebc61b246c
1 file changed