psbt: have wally_tx serialization methods be legible for gen'd code

our code generators expect the serialization name to match the struct
type

bitcoin/psbt.c

@@ -424,7 +424,7 @@ struct wally_psbt *psbt_from_bytes(const tal_t *ctx, const u8 *bytes,
 	return psbt;
 }
 
-void towire_psbt(u8 **pptr, const struct wally_psbt *psbt)
+void towire_wally_psbt(u8 **pptr, const struct wally_psbt *psbt)
 {
 	/* Let's include the PSBT bytes */
 	size_t bytes_written;
@@ -434,8 +434,8 @@ void towire_psbt(u8 **pptr, const struct wally_psbt *psbt)
 	tal_free(pbt_bytes);
 }
 
-struct wally_psbt *fromwire_psbt(const tal_t *ctx,
-				 const u8 **cursor, size_t *max)
+struct wally_psbt *fromwire_wally_psbt(const tal_t *ctx,
+				       const u8 **cursor, size_t *max)
 {
 	struct wally_psbt *psbt;
 	u32 psbt_byte_len;

bitcoin/psbt.h

@@ -70,7 +70,7 @@ const u8 *psbt_get_bytes(const tal_t *ctx, const struct wally_psbt *psbt,
 			 size_t *bytes_written);
 struct wally_psbt *psbt_from_bytes(const tal_t *ctx, const u8 *bytes,
 				   size_t byte_len);
-void towire_psbt(u8 **pptr, const struct wally_psbt *psbt);
-struct wally_psbt *fromwire_psbt(const tal_t *ctx,
-				 const u8 **curosr, size_t *max);
+void towire_wally_psbt(u8 **pptr, const struct wally_psbt *psbt);
+struct wally_psbt *fromwire_wally_psbt(const tal_t *ctx,
+				       const u8 **cursor, size_t *max);
 #endif /* LIGHTNING_BITCOIN_PSBT_H */

bitcoin/tx.c

@@ -652,7 +652,7 @@ struct bitcoin_tx *fromwire_bitcoin_tx(const tal_t *ctx,
 
 	/* pull_bitcoin_tx sets the psbt */
 	tal_free(tx->psbt);
-	tx->psbt = fromwire_psbt(tx, cursor, max);
+	tx->psbt = fromwire_wally_psbt(tx, cursor, max);
 
 	return tx;
 }
@@ -667,7 +667,7 @@ void towire_bitcoin_tx(u8 **pptr, const struct bitcoin_tx *tx)
 	u8 *lin = linearize_tx(tmpctx, tx);
 	towire_u8_array(pptr, lin, tal_count(lin));
 
-	towire_psbt(pptr, tx->psbt);
+	towire_wally_psbt(pptr, tx->psbt);
 }
 
 struct bitcoin_tx_output *fromwire_bitcoin_tx_output(const tal_t *ctx,

tools/generate-wire.py

@@ -235,6 +235,7 @@ class Type(FieldSet):
         'onionmsg_path',
         'route_hop',
         'tx_parts',
+        'wally_psbt',
     ]
 
     # Some BOLT types are re-typed based on their field name