nvme: add CDW2 and CDW3 support for Write Zeroes and Verify Command

nvme: add CDW2 and CDW3 support for Write Zeroes and Verify Command

Added support for the Variable Sized Expected Logical Block Storage Tag(ELBST)
and Expected Logical Block Reference Tag (ELBRT), CDW2 and CDW3 (00:47) bits
for NVM commands Write Zeroes and Verify commands.

Signed-off-by: Gollu Appalanaidu <anaidu.gollu@samsung.com>
[dwagner: removed nvme-ioctl.c changes, these are part of libnvme]
Signed-off-by: Daniel Wagner <dwagner@suse.de>