dds: exclude RAM from impl_reg_io macro

src/dds.rs

@@ -372,6 +372,7 @@ impl_register_io!(
 	0x12,	8,
 	0x13,	8,
 	0x14,	8,
-	0x15,	8,
-	0x16,	4
+	0x15,	8
+	// RAM works in other way
+	// 0x16,	4
 );