arm/ras: Report ARM processor information to userspace

kunpeng inclusion
category: feature
bugzilla: https://bugzilla.openeuler.org/show_bug.cgi?id=45


CVE: NA

The ARM processor error section includes several ARM processor
error information, several ARM processor context information and several
vendor specific error information structures. Report all of these
information to userspace via perf i/f.

Shengwei Luo: backport for openEuler 20.xx kernel.

V2: report severity info to userspace
V1: fix the error in the original patch. Ensure all info to be parsed
correctly.

Original-Author: Jason Tian <jason@os.amperecomputing.com>
Signed-off-by: Gong Chen <chengong15@huawei.com>
Signed-off-by: Shengwei Luo <luoshengwei@huawei.com>
Cc: Chen Wei <chenwei68@huawei.com>
Reviewed-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>