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: Ic7c64f942985596d9a5d919dfd3ca2127de881d0
Signed-off-by: Mahesh Kallelil <kallelil@google.com>