RDMA: Remove outdated comments referencing hfi1_destroy_qp()

RDMA: Remove outdated comments referencing hfi1_destroy_qp()

The function hfi1_destroy_qp() was removed in commit
75261cc6ab66 ("staging/rdma/hfi1: Remove destroy qp verb") in
favor of the rdmavt generic rvt_destroy_qp().  Two comments
still reference hfi1_destroy_qp() as the waiter that
rvt_put_qp() will wake up.  As Leon Romanovsky noted, these
comments add no value.  Remove them.

Suggested-by: Leon Romanovsky <leon@kernel.org>
Assisted-by: unnamed:deepseek-v3.2 coccinelle
Signed-off-by: Kexin Sun <kexinsun@smail.nju.edu.cn>
Link: https://patch.msgid.link/20260323134450.2478-1-kexinsun@smail.nju.edu.cn
Signed-off-by: Leon Romanovsky <leon@kernel.org>