KVM: arm64: Fix Function ID typo for PTP_KVM service

mainline inclusion
from mainline-v5.13-rc1
commit 182a71a3
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8DWT1
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=182a71a3653c4324672fd87e4384fae2fbd63269



--------------------------------

Per include/linux/arm-smccc.h, the Function ID of PTP_KVM service is
defined as ARM_SMCCC_VENDOR_HYP_KVM_PTP_FUNC_ID. Fix the typo in
documentation to keep the git grep consistent.

Signed-off-by: Zenghui Yu <yuzenghui@huawei.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210417113804.1992-1-yuzenghui@huawei.com


Signed-off-by: Dongxu Sun <sundongxu3@huawei.com>