frameworks:base: SystemUI: cleanup a duplicate permission

these permissions are duplicated which i found using a script to check for
duplicate permissions.

submitted to AOSP here: https://android-review.googlesource.com/#/c/104810/

Change-Id: I598ed68836303e3ebc5313342f3ddaee6ccea9b2
(cherry picked from commit 521e840f83d8188da0fd083fb9c030944590b7bb)