i9082: remove unused at* binaries

- atx doesn't seem to do anything and is a pain with SELinux
- at_distributor isn't running since forever due to missing libs

Change-Id: Ia28910a6935511362086d1db83027bfcf07fc2cf
i9082: SELinux policies

/dev/mem is supposed be access by bkmgrd, but that is not allowed
by SELinux. (And bkmgrd isn't seem to be actually accessing it.)
Thus, the chmod is removed

Change-Id: Id7cba5e47a3f12cd749db4f03e2a863374c4a9a5