RDMA/hns: Drop GFP_NOWARN

GFP_NOWARN silences all warnings on dma_alloc_coherent() failure,
which might otherwise help with troubleshooting.

Fixes: 9a443537 ("IB/hns: Add driver files for hns RoCE driver")
Signed-off-by: Junxian Huang <huangjunxian6@hisilicon.com>
Link: https://patch.msgid.link/20250703113905.3597124-6-huangjunxian6@hisilicon.com


Signed-off-by: Leon Romanovsky <leon@kernel.org>