[avf] Fix warning when runnning Microdroid

This cl fixes the following selinux denial:

09-04 10:15:34.544  3393  3393 W binder:3393_2: type=1400 audit(0.0:17): avc:  denied  { getattr } for  path="socket:[99352]" dev="sockfs" ino=99352 scontext=u:r:virtualizationmanager:s0 tcontext=u:r:adbd:s0 tclass=unix_stream_socket permissive=0

Test: Runs the ServiceVmClientApp
Change-Id: I5f69bc966f8e136dab19d1fdc0bc79190bef5ca5
diff --git a/private/virtualizationmanager.te b/private/virtualizationmanager.te
index b6bcd98..36bd409 100644
--- a/private/virtualizationmanager.te
+++ b/private/virtualizationmanager.te
@@ -5,7 +5,7 @@
 
 # Allow virtualizationmanager to communicate use, read and write over the adb connection.
 allow virtualizationmanager adbd:fd use;
-allow virtualizationmanager adbd:unix_stream_socket { read write };
+allow virtualizationmanager adbd:unix_stream_socket { getattr read write };
 
 # Allow writing VM logs to the shell console
 allow virtualizationmanager devpts:chr_file { read write getattr ioctl };