The PCI DSN (device serial number) to format package file name should be
lowercase values.
Fixes: d1c91179e952 ("net/ice: check DSN package file firstly")
Cc: stable@dpdk.org
Signed-off-by: Haiyue Wang <haiyue.wang@intel.com>
Acked-by: Xiaolong Ye <xiaolong.ye@intel.com>