SELinux permissions for companion device system service

Required for I0aeb653afd65e4adead13ea9c7248ec20971b04a

Test: Together with I0aeb653afd65e4adead13ea9c7248ec20971b04a, ensure that the
system service works
Bug: b/30932767
Change-Id: I994b1c74763c073e95d84222e29bfff5483c6a07
2 files changed