Move IProcessInfoService.aidl into aidl_interface

To minimize the changes while using this interface natively,
IProcessInfoService.aidl is moved into aidl_interface

Bug: 438771182
Bug: 407872725
Flag: EXEMPT pure refactor, no API or behavioral changes
Test: manual - media playback through youtube and photo app
Change-Id: I5805ab2492537d3f462c181b7c19829503821df0