RDMA/hns: Introduce limit_bank mode with better performance

RDMA/hns: Introduce limit_bank mode with better performance

In limit_bank mode, QPs/CQs are restricted to using half of the banks.
HW concentrates resources on these banks, thereby improving performance
compared to the default mode.

Switch between limit_bank mode and default mode by setting the cap
flag in FW. Since the number of QPs and CQs will be halved, this mode
is suitable for scenarios where fewer QPs and CQs are required.

Signed-off-by: Lianfa Weng <wenglianfa@huawei.com>
Signed-off-by: Junxian Huang <huangjunxian6@hisilicon.com>
Link: https://patch.msgid.link/20251230154911.3397584-1-huangjunxian6@hisilicon.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>