kernel: 5.10: Backport pci-aardvark driver changes from 5.17

kernel: 5.10: Backport pci-aardvark driver changes from 5.17

Backport Aardvark PCIe controller driver changes that will appear in
5.17 kernel. They are currently accessible on LKML [1], in linux-next
repository [2], or in Bjorn Helgaas' repository [3].

These changes mainly enhance driver removal method.

[1] https://lore.kernel.org/linux-pci/20211130172913.9727-1-kabel@kernel.org/
[2] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/log/drivers/pci?h=next-20220107
[3] https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git/log/?h=next

Signed-off-by: Marek Behún <kabel@kernel.org>