nvme: fix NSSRS offset in CAP register

nvme: fix NSSRS offset in CAP register

Fix the offset of the NSSRS field the CAP register.

From NVME 1.4, section 3 ("Controller Registers"), subsection 3.1.1
("Offset 0h: CAP – Controller Capabilities") CAP_NSSRS_SHIFT is bit 36,
not 33.

Signed-off-by: Klaus Jensen <[email protected]>
Reported-by: Javier Gonzalez <[email protected]>
Message-id: 20191023073315[email protected]
Reviewed-by: John Snow <[email protected]>
[mreitz: Added John's note on the location in the specification where
         this information can be found]
Signed-off-by: Max Reitz <[email protected]>