AudioFlinger: Change timeout for FdToString.

Current implementation waits for 200 msec,
which leads to delay during boot time and other cases
where we close outputs and inputs.
Reduce this time to 2 msecs.

Bug: 171365312
Bug: 172293721
CRs-Fixed: 2776028
Test: See bug for specifics on device and test.
Test: adb shell dumpsys media.audio_flinger
Change-Id: Ia08e8431d36e168bb4a2301cfbd9545f354fa811