i40e: dump descriptor indexes in hex

The debugging helpers for showing descriptor rings were
dumping the indexes in decimal and the offsets in hex.

Put everything in hex and at least be consistent.

Also update copyright year in file header.

Change-ID: Ia35a21411a2ddb713772dffb4e8718889fcfc895
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>