Merge Pull Request from: @leoliu-oc 
 
This driver provides kernel-side support for the Random Number Generator hardware found on Zhaoxin based motherboards.

### Issue
https://gitee.com/openeuler/kernel/issues/I5SMFS

### Test
[zx@openeuler ~]$lsmod | grep zhaoxin_rng

### Known Issue
N/A

### Default config change
CONFIG_HW_RANDOM_ZHAOXIN=m 
 
Link:https://gitee.com/openeuler/kernel/pulls/128 
Reviewed-by: Zheng Zengkai <zhengzengkai@huawei.com> 
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>