Update audio permission checking

Change captureAudioOutputAllowed to check client pid.

Check calling uid with AID_AUDIOSERVER instead of calling pid with
own pid. This is consistent, and works if AudioFlinger and
AudioPolicyManager exist as different processes.

Remove getpid_cached since getpid() is very fast. This removes
any initialization issues.

Replace getuid() with AID_AUDIOSERVER to remove ambiguity of
multiple native audio services for multiple users. Only
one exists regardless of users.

Do not use multiuser UID checks for certain native services
that do not spawn for multiple users to prevent accidently exposure.

Move permission checks to use ServiceUtilities for control and
consistency.

Rename isTrustedCallingUid to isAudioServerOrMediaServerUid
so that permission check is explicitly known to caller.

Update MediaLogService to use ServiceUtilities.

Test: Basic sanity
Test: AudioTrackTest, AudioRecordTest, SoundPool, SoundTrigger
Bug: 79485140
Change-Id: Ib8ccb36929a9b4806c01626f32fa023a046d6020