arm64: Keep HWCAP2_WFXT uapi consistent with upstream

mainline inclusion
from mainline-v5.19-rc1
commit b2c4caf3
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I78WD0



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Currently, the bitfield of HWCAP2_WFXT is (1 << 23)
inconsistent with mainline set (1UL << 31). To avoid
possible uapi break, keep the bitfield consistent
with mainline.

Signed-off-by: Yanan Wang <wangyanan55@huawei.com>