I am sorry to say that it is not possible without root access.
If you do have root access, then there are a number of options. One simple method which I have used in the past is an app called "Notifications Off" from the Play Store. Another more advanced option is to use GravityBox via the Xposed framework.
But care needs to be taken. You can only choose between all or nothing for a given app. Therefore it is only safe to disabled the App Permission Management notifications if you have Permission Management switched off, otherwise you will miss all the dialog boxes which occur when an app requests a permission, causing many apps to be completely unusable.