[MR2] Remove binder call from getSessionReleaseType

AudioManagerRouteController#getSessionReleaseType can be called on binder threads. Therefore, we should not call other classes which could incur in cross process communication. This prevents binder thread exhaustion by ensuring the current binder thread cannot block on a process waiting for binder threads.

Test: atest com.android.server.media.AudioManagerRouteControllerTest
Flag: com.android.media.flags.enable_output_switcher_personal_audio_sharing
Bug: 434734395

Change-Id: Ifff7f0c5fecfeb69e48fc2fa1e7043e90c2b2508