PSA PBKDF2: add new input function

Note on naming: previously considered input_numeric but then thought the
other two input function are "input <name>" not "input <adjective>" so
decided to follow that pattern. input_int would be shorter but sounds
too much like the C type, which could be confusing as that's not the
type of the parameter; IMO "integer" avoids that problem.

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
diff --git a/include/psa/crypto_values.h b/include/psa/crypto_values.h
index 4787dc1..2565ebb 100644
--- a/include/psa/crypto_values.h
+++ b/include/psa/crypto_values.h
@@ -2194,7 +2194,7 @@
 
 /** A cost parameter for password hashing / key stretching.
  *
- * This must be a direct input, passed to psa_key_derivation_input_numeric().
+ * This must be a direct input, passed to psa_key_derivation_input_integer().
  */
 #define PSA_KEY_DERIVATION_INPUT_COST       ((psa_key_derivation_step_t)0x0205)