RDMA/hns: Normalization the judgment of some features

Whether to enable the these features should better depend on the enable
flags, not the value of related fields.

Fixes: 5c1f167a ("RDMA/hns: Init SRQ table for hip08")
Fixes: 3cb2c996

 ("RDMA/hns: Add support for SCCC in size of 64 Bytes")
Link: https://lore.kernel.org/r/1607650657-35992-3-git-send-email-liweihang@huawei.com
Signed-off-by: Wenpeng Liang <liangwenpeng@huawei.com>
Signed-off-by: Weihang Li <liweihang@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>