NVMe: Correct the Controller Configuration settings

The arbitration field was extended by one bit, shifting the shutdown
notification bits by one.  Also, the SQ/CQ entry size was made
configurable for future extensions.

Reported-by: Paul Luse <paul.e.luse@intel.com>
Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>

diff --cc drivers/block/nvme.c
Simple merge

diff --cc include/linux/nvme.h
Simple merge