Remove dead intent related code for LeAudio

This removes currently not used intent object from native evenet
handler.

Tag: #feature
Bug: 261362580
Test: atest LeAudioServiceTest
Change-Id: I3cd2a83910c1f55ef29ce8c828914f56893d3316
Merged-In: I3cd2a83910c1f55ef29ce8c828914f56893d3316
(cherry picked from commit 2715ca42)