DPE: Use external label only for key derivation

Signed-off-by: Maulik Patel <maulik.patel@arm.com>
Change-Id: I1b0004892db305fcb86e0ca18a30bbc2db3469bb
diff --git a/partitions/dice_protection_environment/dpe_certificate.c b/partitions/dice_protection_environment/dpe_certificate.c
index a97457a..d3230e0 100644
--- a/partitions/dice_protection_environment/dpe_certificate.c
+++ b/partitions/dice_protection_environment/dpe_certificate.c
@@ -436,8 +436,8 @@
 
     /* Add label claim */
     add_label_claim(&dpe_cert_ctx,
-                    &layer_ctx->data.attest_key_label[0],
-                    layer_ctx->data.attest_key_label_len);
+                    &layer_ctx->data.external_key_deriv_label[0],
+                    layer_ctx->data.external_key_deriv_label_len);
 
     /* Add public key claim */
     add_public_key_claim(&dpe_cert_ctx,