Revert "Convert AFDO mutators to TransitionMutator"

Revert submission 2925209

Reason for revert: b/323975183

Reverted changes: /q/submissionid:2925209

Change-Id: Ie907d23081817d601a1a2083347b5f683829a36c
diff --git a/rust/afdo.go b/rust/afdo.go
index 6116c5e..323ee36 100644
--- a/rust/afdo.go
+++ b/rust/afdo.go
@@ -44,14 +44,14 @@
 		if err != nil {
 			ctx.ModuleErrorf("%s", err.Error())
 		}
-		if fdoProfileName != "" {
+		if fdoProfileName != nil {
 			actx.AddFarVariationDependencies(
 				[]blueprint.Variation{
 					{Mutator: "arch", Variation: actx.Target().ArchVariation()},
 					{Mutator: "os", Variation: "android"},
 				},
 				cc.FdoProfileTag,
-				[]string{fdoProfileName}...,
+				[]string{*fdoProfileName}...,
 			)
 		}
 	}