Add SGL support for GCM algorithm through JOB API.
This change supports IN-PLACE SGL, OOP SGL IN and LB OUT,
and OOP SGL IN and SGL OUT.
Feature flags are not added, as the PMD does not yet support SGL for
all other algorithms.
If an SGL op for an unsupported algorithm is being processed,
a NULL job is submitted instead.
Signed-off-by: Ciara Power <ciara.power@intel.com> Acked-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>