cgroup: Trace event cgroup id fields should be u64

Various trace event fields that store cgroup IDs were declared as
ints, but cgroup_id(() returns a u64 and the structures and associated
TP_printk() calls were not updated to reflect this.

Fixes: 74321038 ("cgroup: use cgrp->kn->id as the cgroup ID")
Signed-off-by: William Kucharski <william.kucharski@oracle.com>
Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Tejun Heo <tj@kernel.org>