net: hns3: delete unused macro HCLGEVF_MPF_ENBALE

driver inclusion
category: bugfix
bugzilla: NA
CVE: NA

--------------------------------------------

The macro HCLGEVF_MPF_ENBALE is never used, so this patch deletes it.

Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
Signed-off-by: shenhao <shenhao21@huawei.com>
Reviewed-by: Zhong Zhaohui <zhongzhaohui@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>