drivers/disk: Add NVMe controller support

Based on FreeBSD's implementation made by James Harris, Intel Copyright
2012-2016.

Since Zephyr does not propose any advanced interfaces as FreeBSD (bus
abstractions, memory and DMA abstraction and many more), this comes with
a much simplified and Zephyr-ish way to instanciate, initialize and use
NVMe controller.

ToDo: IO Queues cannot be more than 1. Macros will need to be improved to
manage the case of 2+ IO queues.

Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>