RTE_LIBRTE_I40E_ITR_INTERVAL is not used. So it should also be removed
in config/rte_config.h for meson+ninja build.
Fixes: 864a800d70 ("net/i40e: remove VF interrupt handler")
Cc: stable@dpdk.org
Signed-off-by: Qi Zhang <qi.z.zhang@intel.com>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>