Remove ZoneInfoDB.TzData

Remove ZoneInfoDB.TzData as it is not pulling its weight.

This is before potentially exposing a new API in android.timezone that
mirrors the same class structure as libcore.timezone.

Bug: 147884233
Test: build
Change-Id: Ibcf4cddc957b6d46aa8ad16ed619b40aeb59ddc3
4 files changed