Fix build break in mock drm plugin build

Change-Id: I8ae5d378df694360be3d76e06512e2ebc9fc0572
diff --git a/drm/mediadrm/plugins/mock/MockDrmCryptoPlugin.cpp b/drm/mediadrm/plugins/mock/MockDrmCryptoPlugin.cpp
index 6efc712..2ea554b 100644
--- a/drm/mediadrm/plugins/mock/MockDrmCryptoPlugin.cpp
+++ b/drm/mediadrm/plugins/mock/MockDrmCryptoPlugin.cpp
@@ -299,6 +299,12 @@
         return OK;
     }
 
+    status_t MockDrmPlugin::unprovisionDevice()
+    {
+        ALOGD("MockDrmPlugin::unprovisionDevice()");
+        return OK;
+    }
+
     status_t MockDrmPlugin::getSecureStops(List<Vector<uint8_t> > &secureStops)
     {
         Mutex::Autolock lock(mLock);
diff --git a/drm/mediadrm/plugins/mock/MockDrmCryptoPlugin.h b/drm/mediadrm/plugins/mock/MockDrmCryptoPlugin.h
index 97d7052..4b63299 100644
--- a/drm/mediadrm/plugins/mock/MockDrmCryptoPlugin.h
+++ b/drm/mediadrm/plugins/mock/MockDrmCryptoPlugin.h
@@ -85,6 +85,8 @@
                                           Vector<uint8_t> &certificate,
                                           Vector<uint8_t> &wrappedKey);
 
+        status_t unprovisionDevice();
+
         status_t getSecureStops(List<Vector<uint8_t> > &secureStops);
         status_t releaseSecureStops(Vector<uint8_t> const &ssRelease);