linuxkpi: list_sort()'s callback now takes list arguments

This change breaks the API of list_sort(). LINUXKPI_VERSION >= 51300
is used to keep the header compatible with both versions of the
prototype.

Reviewed by: manu
Approved by: manu
Differential Revision: https://reviews.freebsd.org/D38082

(cherry picked from commit a83b3ec719eb6c53658656b7b90607564d3c64d3)