Remove distro generation code and its mentions.

distro files are for TZUvA feature, which was superseded by tzdata
mainline module(s).

Bug: 148144561
Test: m
Test: CtsLibcoreTestCases
Test: CtsLibcoreOjTestCases
Test: CtsIcuTestCases
Test: CtsBionicTestCases
Test: CtsTextTestCases
Change-Id: I16df86cf4c63db0481f658ffd65efc00a2a12e88
Merged-In: I16df86cf4c63db0481f658ffd65efc00a2a12e88
43 files changed