Add getFrontendInfo API in TunerService

This CL added a new aidl API implementation into TunerService
Also build up the aidl FrontendInfo from Tuner HAL FrontendInfo
to pass to Tuner java

Test: atest TunerTest
Bug: 170684039
Change-Id: Ibe0f8d43d3710e3bd7eb5d0454a306daf5e1194c