Currently bhyve nvme controller will parse all configs in pci_nvme.c.
while options such as nocache/nodelete/sync/ro/sectorsize
are ignored and return error.
This patch will enable nvme controller pass unknown config
to blockif_open if using blockif storge.
After apply this patch, blockif can properly get the sectorsize,
no need to specify this value in nvme controller.
(ram backend is fixed to 4096.)