RDMA/core: Remove unused ib_copy_path_rec_from_user

ib_copy_path_rec_from_user() has been unused since 2019's
commit a1a8e4a8 ("rdma: Delete the ib_ucm module")

Remove it.

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Link: https://patch.msgid.link/20241221014021.343979-5-linux@treblig.org


Reviewed-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>