TIS: Make constants in TvInputServiceExtensionManager SystemApi

Making constants defining standardized AIDL interfaces names SystemApi
so that they would be accessible by SoC/OEMs.

Bug: b/330366987
Flag: android.media.tv.flags.tif_extension_standardization
Test: m (constant only)

Change-Id: I54830299f060434fb939bbe59b4fcedddbca6a1f
2 files changed