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 P23
Bug: 278501642
Change-Id: I336d712ea9e4bc2cfe08195f64089b68dd283fe6
Signed-off-by: Mahesh Kallelil <kallelil@google.com>