arm64: Errata: fix kabi changed by cpu_errata

ascend inclusion
category: feature
bugzilla: 46922
CVE: NA

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Patch "cache: Workaround HiSilicon Taishan DC CVAU"
breaks the kabi symbols:
cpu_hwcaps
cpu_hwcap_keys

Fix by using CONFIG_HISILICON_ERRATUM_1980005 to protect it.

Signed-off-by: Weilong Chen <chenweilong@huawei.com>
Reviewed-by: Cheng Jian <cj.chengjian@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>