Add mediadrm service

Part of media security hardening

This is an intermediate step toward moving
mediadrm to a new service separate from mediaserver.
This first step allows mediadrmservice to run based
on the system property media.mediadrmservice.enable
so it can be selectively enabled on devices that
support using native_handles for secure buffers.

bug: 22990512
Change-Id: I9fecb59158d560201f64721cdc026f5604cc3945
diff --git a/target/product/base.mk b/target/product/base.mk
index baa8759..acc643b 100644
--- a/target/product/base.mk
+++ b/target/product/base.mk
@@ -105,6 +105,7 @@
     libwifi-service \
     media \
     media_cmd \
+    mediadrmserver \
     mediaserver \
     mediacodec \
     mediaextractor \