Allow dumpstate to access netlink_generic_socket

avc: denied { create } for scontext=u:r:dumpstate:s0 tcontext=u:r:dumpstate:s0 tclass=netlink_generic_socket permissive=0
avc: denied { create } for comm="iotop" scontext=u:r:dumpstate:s0 tcontext=u:r:dumpstate:s0 tclass=netlink_generic_socket permissive=0

Bug: 68040531
Change-Id: I24a8a094d1b5c493cc695e332c927972f99ae49c