hinic3: Add msg_send_lock for message sending concurrecy

As send_mbox_msg is invoked by 3 functions: hinic3_send_mbox_to_mgmt,
hinic3_response_mbox_to_mgmt and hinic3_send_mbox_to_mgmt_no_ack, only
hinic3_response_mbox_to_mgmt does not has mutex and the other two has
mbox->mbox_send_lock because their send actions are mutually exclusive.
  As hinic3_response_mbox_to_mgmt does not conflict with them in send
actions but in mailbox resources, add the new mutex(msg_send_lock) in
send_mbox_msg to ensure message concurrency.

  Besdies, in mbox_send_seg change FIELD_PREP to FIELD_GET in
MBOX_STATUS_FINISHED and MBOX_STATUS_SUCCESS to be more reasonable.

Co-developed-by: Zhu Yikai <zhuyikai1@h-partners.com>
Signed-off-by: Zhu Yikai <zhuyikai1@h-partners.com>
Signed-off-by: Fan Gong <gongfan1@huawei.com>
Link: https://patch.msgid.link/d83f7f6eb4b5e94642a558fab75d61292c347e48.1773062356.git.zhuyikai1@h-partners.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

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