crash_dump: dontaudit devices passed by exec()

avc: denied { read } for comm="crash_dump64" name="v4l-touch22"
dev="tmpfs" ino=18821 scontext=u:r:crash_dump:s0
tcontext=u:object_r:input_device:s0 tclass=chr_file

Test: build
Change-Id: Iac66b77ad255c950b21fd267c88fdbc382be2877