Revert "Don't build hiddenapi flags or encode dex for unbundled builds"

This reverts commit 7b8a567f.

Bug: 137282010
Test: With the CL above this one, the unbundled mainline module build
does not fail.

Merged-In: I2f49fa7dbe1da92cb282a9bc14acd5830888ed17
Change-Id: I2f49fa7dbe1da92cb282a9bc14acd5830888ed17
(cherry picked from commit 716828ab)