Adjust tuner JNI types size.

This CL also cleans up the unused type casting after moving to AIDL HAL.

TODO: change frequency in java to long to cover frequency bigger than
INT32_MAX.

Bug: 195693712
Test: atest android.media.tv.tuner.cts
Change-Id: I9bc006882d29a27cddd0399a537154579eb0a0dc