sched_ext: Fix scx_bpf_reenqueue_local() reference

The comment mentions bpf_scx_reenqueue_local(), but the function
is provided for the BPF program implementing scx, as such the
naming convention is scx_bpf_reenqueue_local(), fix the comment.

Signed-off-by: Christian Loehle <christian.loehle@arm.com>
Signed-off-by: Tejun Heo <tj@kernel.org>