IDrm: remove IBinder inheritance

Bug: 134787536
Test: GtsMediaTestCases
Change-Id: I8e409e7048c9058f2d91ad2d467131f49e378259
diff --git a/drm/libmediadrm/include/mediadrm/DrmHal.h b/drm/libmediadrm/include/mediadrm/DrmHal.h
index 0431c93..df1a79f 100644
--- a/drm/libmediadrm/include/mediadrm/DrmHal.h
+++ b/drm/libmediadrm/include/mediadrm/DrmHal.h
@@ -57,7 +57,7 @@
     return memcmp(l.array(), r.array(), l.size()) == 0;
 }
 
-struct DrmHal : public BnDrm,
+struct DrmHal : public IDrm,
                 public IBinder::DeathRecipient,
                 public IDrmPluginListener_V1_2 {