Remove unused methods from INetworkManagementService

Remove unused public methods setPermission() and clearPermission()

Bug: 114231106
Test: make

Change-Id: I7acbbd36f41bef1356a158bed075c7be330728f4
(cherry picked from commit a430eda4ddbd9ac55d1b4def92885de08cec4bfb)
2 files changed