locking/lockdep: Cleanup the repeated declaration

'struct task_struct' has been decleared twice, so keep the top one and
cleanup the repeated one.

Signed-off-by: Shaokun Zhang <zhangshaokun@hisilicon.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/1629875224-32751-1-git-send-email-zhangshaokun@hisilicon.com