Add file context for /dev/logbuffer_tcpm

/dev/logbuffer_tcpm gets accessed by dumpstate while bugreport
generation.

(Port of ag/15019635)

Bug: 189792358
Signed-off-by: Kyle Tso <kyletso@google.com>
Change-Id: Id73f7c884f45364b5386a9fe13900cb94d914520
1 file changed