KVM: arm64: nv: Expose FEAT_DF2 to NV-enabled VMs

The supporting infrastructure in KVM's abort injection code was merged a
while ago, but the author (me!) forgot to relax the NV limitation when
FEAT_DF2 got exposed to non-NV VMs. Fix it.

Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Marc Zyngier <maz@kernel.org>

Author: oupton

arch/arm64/kvm/nested.c

@@ -1463,7 +1463,6 @@ u64 limit_nv_id_reg(struct kvm *kvm, u32 reg, u64 val)
 	case SYS_ID_AA64PFR1_EL1:
 		/* Only support BTI, SSBS, CSV2_frac */
 		val &= ~(ID_AA64PFR1_EL1_PFAR		|
-			 ID_AA64PFR1_EL1_DF2		|
 			 ID_AA64PFR1_EL1_MTEX		|
 			 ID_AA64PFR1_EL1_THE		|
 			 ID_AA64PFR1_EL1_GCS		|