MediaTranscodingService: Bring up the services.

Bug: 145233472
Test: Build and flash the phone. dumpsys to show the service up and
running.

Change-Id: I179bf6b5048261a843a5058058102ca51f496e2b
diff --git a/target/product/base_system.mk b/target/product/base_system.mk
index 08db037..415158b 100644
--- a/target/product/base_system.mk
+++ b/target/product/base_system.mk
@@ -206,6 +206,7 @@
     media_profiles_V1_0.dtd \
     MediaProvider \
     mediaserver \
+    mediatranscoding \
     mke2fs \
     monkey \
     mtpd \