Enable DRM HIDL HAL by default

Eliminate ENABLE_TREBLE since it is obsolete.
Switching back to legacy DRM is still possible
by building with DISABLE_TREBLE_DRM=true

Change-Id: I6b921050dff6162112c60df21549fc93bc46e379
diff --git a/drm/libmediadrm/DrmHal.cpp b/drm/libmediadrm/DrmHal.cpp
index 42dce35..4ef1f47 100644
--- a/drm/libmediadrm/DrmHal.cpp
+++ b/drm/libmediadrm/DrmHal.cpp
@@ -202,6 +202,8 @@
     if (factory == NULL) {
         ALOGE("Failed to make drm factory");
     }
+    ALOGD("makeDrmFactory: service is %s",
+            factory->isRemote() ? "Remote" : "Not Remote");
     return factory;
 }