KVM: arm64: Use {read,write}_sysreg_el1 to access ZCR_EL1

mainline inclusion
from mainline-v5.13-rc1
commit 83857371
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I8E73O
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=83857371d4cbeff8551fa770e045be9c6b04715c



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Switch to the unified EL1 accessors for ZCR_EL1, which will make
things easier for nVHE support.

Acked-by: Will Deacon <will@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Wang ShaoBo <bobo.shaobowang@huawei.com>