(halium11) libaudioclient: Fix infinite loop in get_audio_flinger()

[berbascum]

In Halium environments, AudioFlinger is replaced by CameraRecordService for audio recording.

However, get_audio_flinger() still attempts to contact AudioFlinger
using an infinite blocking loop:

do {
    binder = sm->getService(String16("media.audio_flinger"));
    if (binder != 0)
        break;
    ALOGW("AudioFlinger not published, waiting...");
    usleep(500000);
} while (true);

When AudioFlinger is not started, getService() never succeeds,
and the function remains trapped in the infinite while(true=) loop,
blocking the audio thread indefinitely.

Impact:
Camera video recording with audio in hardware mode might fail
on halium-11 for some devices.

Solution:
Check for CameraRecordService. If running, skip audioflinger wait loop.

• Tested on Xiaomi POCO X3 Pro (vayu) running Droidian-101/Halium-11.
• Camera app: new droidian-camera from 102 (qt6 hybris-compat)
  https://github.com/droidian/droidian-camera/tree/feature/next/hybris-compat
• Camera video recording with audio in hw mode now works.