Do not enable AFDO if the option is off, even if there is a profile file

The behaviour is accidentally changed during the Bazel migration.

Test: m
Change-Id: I44158f2518776c68938ad2ddab01431005a333b0

cc/afdo.go

@@ -131,6 +131,10 @@ func (c *Module) fdoProfileMutator(ctx android.BottomUpMutatorContext) {
 		return
 	}
 
+	if !c.afdo.afdoEnabled() {
+		return
+	}
+
 	ctx.VisitDirectDepsWithTag(FdoProfileTag, func(m android.Module) {
 		if ctx.OtherModuleHasProvider(m, FdoProfileProvider) {
 			info := ctx.OtherModuleProvider(m, FdoProfileProvider).(FdoProfileInfo)