MFC r335034:

Fix build of liquidio with base gcc on i386

Some casts from pointers to uint64_t and back in lio_main.c cause base
gcc on i386 to warn "cast from pointer to integer of different size",
and vice versa. Add additional casts to uintptr_t to suppress these.

Reviewed by: sbruno
Differential Revision: https://reviews.freebsd.org/D15754

Merge r323509 and r324994 adding Cavium LiquidIO Driver (lio)
to stable/11.

Submitted by: pkanneganti@cavium.com ((Prasad V Kanneganti)
Sponsored by: Cavium Networks
Differential Revision: https://reviews.freebsd.org/D12425