Reorganize drm hal modules

Previously the drm and crypto plugins were separate hals.
This implied a separation of implementation libraries which
causes problems for some drm schemes. The reorganization
combines the hals into a single interface under drm.

Tests: basic gtests passing

Change-Id: I5cde6ff9f60625a0219731c4dbfcaefbd9f27f88
related-to-bug: 32815560
diff --git a/drm/Android.bp b/drm/Android.bp
index 412e162..bbb3e4b 100644
--- a/drm/Android.bp
+++ b/drm/Android.bp
@@ -1,5 +1,4 @@
 // This is an autogenerated file, do not edit.
 subdirs = [
-    "crypto/1.0",
-    "drm/1.0",
+    "1.0",
 ]