Address SELinux denials for logpersist

denied { getattr } for comm="logcat" path="/dev/vport0p1" dev="tmpfs" scontext=u:r:logpersist:s0 tcontext=u:object_r:device:s0 tclass=chr_file
denied { open } for comm="logcat" path="/dev/vport0p1" dev="tmpfs" scontext=u:r:logpersist:s0 tcontext=u:object_r:device:s0 tclass=chr_file
denied { append } for comm="logcat" path="/dev/vport0p1" dev="tmpfs" scontext=u:r:logpersist:s0 tcontext=u:object_r:device:s0 tclass=chr_file

Test: Device boots, no SELinux denials for logpersist
Bug: 28053261
Change-Id: Ie8082e40f6020d431c308359c5a66c51260cfc40
3 files changed