KVM: arm64: Drop obsolete comment about sys_reg ordering

The general comment about keeping the enum order in sync
with the save/restore code has been obsolete for many years now.

Just drop it.

Note that there are other ordering requirements in the enum,
such as the PtrAuth and PMU registers, which are still valid.
Reported-by: NJames Morse <james.morse@arm.com>
Signed-off-by: NMarc Zyngier <maz@kernel.org>

arch/arm64/include/asm/kvm_host.h

@@ -115,12 +115,8 @@ struct kvm_vcpu_fault_info {
 	u64 disr_el1;		/* Deferred [SError] Status Register */
 };
 
-/*
- * 0 is reserved as an invalid value.
- * Order should be kept in sync with the save/restore code.
- */
 enum vcpu_sysreg {
-	__INVALID_SYSREG__,
+	__INVALID_SYSREG__,   /* 0 is reserved as an invalid value */
 	MPIDR_EL1,	/* MultiProcessor Affinity Register */
 	CSSELR_EL1,	/* Cache Size Selection Register */
 	SCTLR_EL1,	/* System Control Register */