Simplify psa_pake_computation_stage_s structure

Signed-off-by: Przemek Stekiel <przemyslaw.stekiel@mobica.com>
diff --git a/include/psa/crypto_extra.h b/include/psa/crypto_extra.h
index 83c7e04..75ce1a3 100644
--- a/include/psa/crypto_extra.h
+++ b/include/psa/crypto_extra.h
@@ -1976,7 +1976,7 @@
 struct psa_pake_computation_stage_s {
     union {
         unsigned dummy;
-        psa_jpake_computation_stage_t MBEDTLS_PRIVATE(jpake_computation_stage);
+        psa_jpake_computation_stage_t MBEDTLS_PRIVATE(jpake);
     } MBEDTLS_PRIVATE(data);
 };