neverallows in Soong

Straightforward way of expressing policy inspired by a similar
syntax in SELinux.

Bug: 70165717
Test: no neverallows hit
Test: manually checking neverallow rules by changing them/adding violations
Change-Id: I7e15a0094d1861391bfe21a2ea30797d7593c142
diff --git a/android/mutator.go b/android/mutator.go
index 876d161..8de57e1 100644
--- a/android/mutator.go
+++ b/android/mutator.go
@@ -92,6 +92,7 @@
 
 var postDeps = []RegisterMutatorFunc{
 	RegisterPrebuiltsPostDepsMutators,
+	registerNeverallowMutator,
 }
 
 func PreArchMutators(f RegisterMutatorFunc) {