igbvf: Remove two unused declarations

There is no caller and implementations in tree.

Signed-off-by: Yue Haibing <yuehaibing@huawei.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20240816101638.882072-1-yuehaibing@huawei.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>