Remove DISABLE_TREBLE_DRM

This flag is obsolete now that the conversion
to treble is complete.

Change-Id: I7073d337939da43bddf99644bfe52db9baa2f605
Merged-In: I7073d337939da43bddf99644bfe52db9baa2f605
related-to-bug: 32815560
(cherry picked from commit 99a5aba027cca8d3e69e333b56168a223e053d82)
5 files changed