e1000: fix timeout for shadow RAM write

This fixes the timed out for shadow RAM write EEWR can't be detected.

Fixes: 5a32a257f957 ("e1000: more NICs in base driver")
Cc: stable@dpdk.org

Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
Signed-off-by: Min Hu (Connor) <humin29@huawei.com>
Acked-by: Haiyue Wang <haiyue.wang@intel.com>

Approved by: imp
Obtained from: DPDK (4a8ab48ec47b3616272e50620b8e1a9599358ea6)
MFC after: 1 week

(cherry picked from commit f6517a7e69c10c6057d6c990a9f3ea22a2b62398)