Huawei BMA: Adding Huawei BMA driver: host_edma_drv

driver inclusion
category: feature
bugzilla: 34535
CVE: NA

The BMA software is a system management software offered by Huawei. It supports
the status monitoring, performance monitoring, and event monitoring of various
components, including server CPUs, memory, hard disks, NICs, IB cards, PCIe
cards, RAID controller cards, and optical modules.

This host_edma_drv driver is a PCIe driver used by Huawei BMA software. The main
function of it is to control the PCIe bus between BMA software and Huawei 1711
chip. The chip will then process the data and display to users. This
host_edma_drv driver offers API to send/receive data for other BMA drivers which
want to use the PCIe channel in different ways(eg.host_cdev_drv, host_veth_drv).

Link: https://lkml.org/lkml/2020/6/22/752


Signed-off-by: Naixin Yu <yunaixin@huawei.com>
Reviewed-by: Wang Qindong <wangqindong@huawei.com>
Acked-by: Xie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Cheng Jian <cj.chengjian@huawei.com>