CSD: Add default AIDL HAL implementation

** Partial upstream of ag/24854732. Only the interface part is
** included.

This should enable the sound dose gts on cuttlefish devices. The sound
dose HAL uses the internal MelProcessor to compute the MELs which are
reported to the framework.

Test: atest GtsAudioTestCases:SoundDoseTest
Bug: 301527435
Change-Id: Ifc505a0171bc8b4d3f5cf65d950fa5c0f812087f
Merged-In: Ifc505a0171bc8b4d3f5cf65d950fa5c0f812087f