Allow dumpstate to run iotop

Test: adb bugreport
Bug: 63629306
Change-Id: I7a366b199ddd0ec303dc25ca8c35764c5d7e3af8

public/dumpstate.te

@@ -250,6 +250,9 @@ binder_call(dumpstate, installd);
 # Allow dumpstate to run ip xfrm policy
 allow dumpstate self:netlink_xfrm_socket { create_socket_perms_no_ioctl nlmsg_read };
 
+# Allow dumpstate to run iotop
+allow dumpstate self:netlink_socket create_socket_perms_no_ioctl;
+
 ###
 ### neverallow rules
 ###