KVM: arm64: expose ID_AA64MMFR3_EL1 to guests

Now that KVM context switches the appropriate registers, expose ID_AA64MMFR3_EL1
to guests to allow them to use the new features.

Signed-off-by: Joey Gouly <joey.gouly@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Oliver Upton <oliver.upton@linux.dev>
Cc: James Morse <james.morse@arm.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Zenghui Yu <yuzenghui@huawei.com>
Cc: Will Deacon <will@kernel.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230606145859.697944-11-joey.gouly@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

arch/arm64/kvm/sys_regs.c

@@ -1873,7 +1873,7 @@ static const struct sys_reg_desc sys_reg_descs[] = {
 	ID_SANITISED(ID_AA64MMFR0_EL1),
 	ID_SANITISED(ID_AA64MMFR1_EL1),
 	ID_SANITISED(ID_AA64MMFR2_EL1),
-	ID_UNALLOCATED(7,3),
+	ID_SANITISED(ID_AA64MMFR3_EL1),
 	ID_UNALLOCATED(7,4),
 	ID_UNALLOCATED(7,5),
 	ID_UNALLOCATED(7,6),