Go back to the old serial number with an underscore

BUG: 64811368

This reverts commit d82b5016a3786425aa3fd200713dd3eb7afc66c5.

Change-Id: I9b939cd597ac6f00b57b9c7be294097b4d68fa40
(cherry picked from commit e07b5c7027aabe2f21cd9795be47fd07edac838b)
diff --git a/ivserver/vsoc_mem.json b/ivserver/vsoc_mem.json
index 200da58..3377763 100644
--- a/ivserver/vsoc_mem.json
+++ b/ivserver/vsoc_mem.json
@@ -8,7 +8,7 @@
 	    "androidboot.hardware=vsoc",
 	    "security=selinux",
 	    "androidboot.selinux=permissive",
-	    "androidboot.serialno=435554544c4501",
+	    "androidboot.serialno=CUTTLEFISHAVD01",
 	    "enforcing=0",
 	    "audit=0",
 	    "CUTTLEFISH"