RDMA/hns: Remove VF extend configuration

driver inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7A2PB



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Remove VF extend configuration since the relative registers are
configured in firmware currently.

Fixes: 7e3913a7 ("RDMA/hns: Support getting max QP number from firmware")
Signed-off-by: Junxian Huang <huangjunxian6@hisilicon.com>