Declare multipart AEAD functions

Declare and document multipart AEAD functions.

This commit does not contain any implementation or tests.
diff --git a/library/psa_crypto.c b/library/psa_crypto.c
index c1cfe7d..da3321e 100644
--- a/library/psa_crypto.c
+++ b/library/psa_crypto.c
@@ -3053,7 +3053,7 @@
     uint8_t tag_length;
 } aead_operation_t;
 
-static void psa_aead_abort( aead_operation_t *operation )
+static void psa_aead_abort_internal( aead_operation_t *operation )
 {
     switch( operation->core_alg )
     {
@@ -3140,7 +3140,7 @@
     return( PSA_SUCCESS );
 
 cleanup:
-    psa_aead_abort( operation );
+    psa_aead_abort_internal( operation );
     return( status );
 }
 
@@ -3211,7 +3211,7 @@
         memset( ciphertext, 0, ciphertext_size );
 
 exit:
-    psa_aead_abort( &operation );
+    psa_aead_abort_internal( &operation );
     if( status == PSA_SUCCESS )
         *ciphertext_length = plaintext_length + operation.tag_length;
     return( status );
@@ -3308,7 +3308,7 @@
         memset( plaintext, 0, plaintext_size );
 
 exit:
-    psa_aead_abort( &operation );
+    psa_aead_abort_internal( &operation );
     if( status == PSA_SUCCESS )
         *plaintext_length = ciphertext_length - operation.tag_length;
     return( status );