make com.android.mediadrm.signer available on all devices

bug: 16978496
Change-Id: I238e6fa7fc4e588f52f86130a2721c391959a94a
diff --git a/target/product/core_minimal.mk b/target/product/core_minimal.mk
index b0e3c5a..880a0fd 100644
--- a/target/product/core_minimal.mk
+++ b/target/product/core_minimal.mk
@@ -36,6 +36,8 @@
     com.android.location.provider.xml \
     com.android.media.remotedisplay \
     com.android.media.remotedisplay.xml \
+    com.android.mediadrm.signer \
+    com.android.mediadrm.signer.xml \
     drmserver \
     ethernet-service \
     framework-res \