nvme-pci: call nvme_pci_configure_admin_queue from nvme_pci_enable

nvme_pci_configure_admin_queue is called right after nvme_pci_enable, and
it's work is undone by nvme_dev_disable.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Tested-by Gerd Bayer <gbayer@linxu.ibm.com>