Rename psa_pake_data_t

"Data" is too vague, renaming it to psa_pake_step_t. It is still
somewhat vague, but at least consistent with the naming used in key
derivation.

Signed-off-by: Janos Follath <janos.follath@arm.com>
diff --git a/include/psa/crypto_sizes.h b/include/psa/crypto_sizes.h
index 4428fc0..9d2f6c4 100644
--- a/include/psa/crypto_sizes.h
+++ b/include/psa/crypto_sizes.h
@@ -1144,7 +1144,7 @@
  * \param alg           A PAKE algorithm (PSA_ALG_XXX value such that
  *                      #PSA_ALG_IS_PAKE(\p alg) is true).
  * \param cipher_suite  A cipher suite that is compatible with algorithm \p alg.
- * \param output_step   A value of type ::psa_pake_data_t that is valid for the
+ * \param output_step   A value of type ::psa_pake_step_t that is valid for the
  *                      algorithm \p alg.
  * \return              A sufficient output buffer size for the specified
  *                      output, cipher suite and algorithm. If the cipher suite,