[VOLD] Add ARC++ ObbMount shared lib

Unfortunately, static library dependency is not transitive (even if the
dependency is a shared library). So I am wrapping the libarcobbvolume's
dependency as libarcmounter shared library.

Bug: 64500663
Test: Compile
Change-Id: I12be7a9d885c7c1c043185bd134e0148d420c6fd
diff --git a/Android.bp b/Android.bp
index 0a45395..3760285 100644
--- a/Android.bp
+++ b/Android.bp
@@ -135,6 +135,9 @@
             static_libs: [
                 "libarcobbvolume",
             ],
+            shared_libs: [
+                "libarcmounter",
+            ],
         },
     },
 }
@@ -152,7 +155,11 @@
         arc: {
             static_libs: [
                 "libarcobbvolume",
-            ]
+            ],
+            shared_libs: [
+                "libarcmounter",
+            ],
+
         },
     },
     init_rc: ["vold.rc"],