Move class bpf definition

No functional change. This reorg just makes it easier to perform diffs
against https://github.com/SELinuxProject/refpolicy/blob/master/policy/flask/access_vectors

Test: policy builds.
Change-Id: I10cf9547d57981c76ee7e76daa382bb504e36d0b

private/access_vectors

@@ -282,15 +282,6 @@ inherits socket
 class unix_dgram_socket
 inherits socket
 
-class bpf
-{
-	map_create
-	map_read
-	map_write
-	prog_load
-	prog_run
-}
-
 #
 # Define the access vector interpretation for process-related objects
 #
@@ -677,6 +668,15 @@ inherits socket
 class smc_socket
 inherits socket
 
+class bpf
+{
+	map_create
+	map_read
+	map_write
+	prog_load
+	prog_run
+}
+
 class property_service
 {
 	set