nvme: Fix error in nvme_setup_prps

Consulting to "NVM Express® Base Specification, revision 2.0".

If more PRP List pages are required, then the last entry of
the PRP List contains the Page Base Address of the next PRP
List page. The next PRP List page shall be memory page aligned.

Signed-off-by: Jon Lin <jon.lin@rock-chips.com>
Reviewed-by: Shawn Lin <shawn.lin@rock-chips.com>