<linux/nvme.h>: Correct NVMF enum values to match NVMe-oF rev 1.0

<linux/nvme.h>: Correct NVMF enum values to match NVMe-oF rev 1.0

The enum values for QPTYPE, PRTYPE and CMS are off by 1 from the
values defined in figure 42 of the NVM Express over Fabrics 1.0:

    http://www.nvmexpress.org/wp-content/uploads/NVMe_over_Fabrics_1_0_Gold_20160605-1.pdf

Fix our enums to match the final spec.

The matching fix to the kernel include has been submitted as well:

    http://lists.infradead.org/pipermail/linux-nvme/2017-March/008612.html

Signed-off-by: Roland Dreier <roland@purestorage.com>