staging: ccree: Cleanup: remove references to page_link

This is a layering violation so we replace it with calls to
sg_page. This is a prep patch for replacing page_link and this
is one of the very few uses outside of scatterlist.h.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Stephen Bates <sbates@raithlin.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Gilad Ben-Yossef <gilad@benyossef.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>