Add a new system service for blob store management.

This change adds a bare-bones system service, implementation will follow
later.

Bug: 143559646
Test: atest cts/tests/BlobStore/src/com/android/cts/blob/BlobStoreManagerTest.java
Change-Id: I344cc516d364c5148be3b4994d630fad5f73cf27
diff --git a/target/product/media_system.mk b/target/product/media_system.mk
index 0bc5800..9d27dee 100644
--- a/target/product/media_system.mk
+++ b/target/product/media_system.mk
@@ -56,6 +56,7 @@
     com.android.location.provider \
     jobscheduler-service \
     statsd-service \
+    blobstore-service \
 
 PRODUCT_COPY_FILES += \
     system/core/rootdir/etc/public.libraries.android.txt:system/etc/public.libraries.txt