Add the support of Hisilicon HiP01 debug uart.
The uart of hip01 is 8250 compatible.
Signed-off-by: NWang Long <long.wanglong@huawei.com>
Signed-off-by: NWei Xu <xuwei5@hisilicon.com>
Signed-off-by: NOlof Johansson <olof@lixom.net>