Setting the owner of /dev/logbuffer_cpif as system to allow the
dump_modem script to read the logs as part of bugreport
Test: Tested bugreport on device
Bug: 305600375
Change-Id: I20c1a843edadbc4ed2da51af3e242957b5849d6b
Signed-off-by: Mahesh Kallelil <kallelil@google.com>