KVM: arm64: Expose the WFXT feature to guests

mainline inclusion
from mainline-v5.19-rc1
commit 06e0b802
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I6YAMV
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=06e0b802583d7bbc075476d90da995ee3e6053d5



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Plumb in the capability, and expose WFxT to guests when available.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20220419182755.601427-8-maz@kernel.org


Signed-off-by: Kunkun Jiang <jiangkunkun@huawei.com>