net/igc: remove use of uint type

net/igc: remove use of uint type

Improve portability (especially with musl libc)
by replacing the non-standard type 'uint' with 'size_t'.

Fixes: 746664d546fb ("net/igc: support flow API")
Cc: stable@dpdk.org
Suggested-by: David Marchand <david.marchand@redhat.com>
Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
Acked-by: Haiyue Wang <haiyue.wang@intel.com>
Acked-by: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>
Acked-by: David Marchand <david.marchand@redhat.com>