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

public/dumpstate.te

@@ -263,6 +263,8 @@ allow dumpstate self:netlink_xfrm_socket { create_socket_perms_no_ioctl nlmsg_re
 
 # Allow dumpstate to run iotop
 allow dumpstate self:netlink_socket create_socket_perms_no_ioctl;
+# newer kernels (e.g. 4.4) have a new class for sockets
+allow dumpstate self:netlink_generic_socket create_socket_perms_no_ioctl;
 
 ###
 ### neverallow rules