MdePkg: Add a header for NVMe v1.1 spec. definitions.
Adds a public header for NVMe v1.1 spec. definitions. The majority
of these definitions where copied from a private header in
MdeModulePkg/Bus/Pci/NvmExpress/NvmExpressHci.h. Additional
definitions were added e.g. the NVMe Smart Health Log and
Firmware Info. Log structures. These definitions should be
in a public header so that clients of the NVMe passthru protocol
can use them to execute NVMe commands.