hinic3: Mailbox framework

Add mailbox framework initialization.
It allows driver to send commands to HW.

Co-developed-by: Xin Guo <guoxin09@huawei.com>
Signed-off-by: Xin Guo <guoxin09@huawei.com>
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/084f22f0155aaa713fa583205d540cb2bf3c3c2d.1755673097.git.zhuyikai1@h-partners.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>