RDMA/hns: Add cap_flag check for check_vf_support()

driver inclusion
category: cleanup
bugzilla: https://gitee.com/openeuler/kernel/issues/I8O0QJ



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check_vf_support() aims to prevent the init of roce vf whose
corresponding pf is in a bond group. For devices that doesn't
support bonding, there is no need to execute this checking.

Fixes: a1598d86 ("RDMA/hns: fix the error of RoCE VF based on RoCE Bonding PF")
Signed-off-by: Junxian Huang <huangjunxian6@hisilicon.com>
Signed-off-by: Juan Zhou <zhoujuan51@h-partners.com>