KVM: arm64: Some fixes of PV-time interface document

Rename PV_FEATURES to PV_TIME_FEATURES.

Signed-off-by: Keqian Zhu <zhukeqian1@huawei.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Link: https://lore.kernel.org/r/20200817110728.12196-2-zhukeqian1@huawei.com

Documentation/virt/kvm/arm/pvtime.rst

@@ -19,8 +19,8 @@ Two new SMCCC compatible hypercalls are defined:
 
 These are only available in the SMC64/HVC64 calling convention as
 paravirtualized time is not available to 32 bit Arm guests. The existence of
-the PV_FEATURES hypercall should be probed using the SMCCC 1.1 ARCH_FEATURES
-mechanism before calling it.
+the PV_TIME_FEATURES hypercall should be probed using the SMCCC 1.1
+ARCH_FEATURES mechanism before calling it.
 
 PV_TIME_FEATURES
     ============= ========    ==========