net: txgbe: use pci_dev_id() helper

PCI core API pci_dev_id() can be used to get the BDF number for a PCI
device. We don't need to compose it manually. Use pci_dev_id() to
simplify the code a little bit.

Signed-off-by: Yu Liao <liaoyu15@huawei.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20240826012100.3975175-1-liaoyu15@huawei.com


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