Support set/clear/get preferred device for capture preset.

Support set/clear/get preferrd device for capture preset. The preferred
device will be used for audio routing when it is availabled. The
preferred device doesn't need to be present when setting.

Bug: 160352965
Test: atest AudioServiceTest
Test: atest AudioServiceHostTest
Test: atest CarAudioZonesHelperTest

Change-Id: Ib7aa142ad4c56a8138c7b440e8efbbf7a7ee38a6
Merged-In: Ib7aa142ad4c56a8138c7b440e8efbbf7a7ee38a6