toolchain: replace ifc interface compiler with xpcg

xpcg is used to generate xpc interfaces

toolchain/xpcg/type.h

@@ -0,0 +1,20 @@
+#ifndef XPCG_TYPE_H_
+#define XPCG_TYPE_H_
+
+enum type_id {
+	TYPE_NONE,
+	TYPE_INT,
+	TYPE_SIZE,
+	TYPE_STRING,
+	TYPE_BUFFER,
+	TYPE_HANDLE,
+	TYPE_OTHER,
+};
+
+struct type {
+	enum type_id ty_id;
+};
+
+extern void type_print(const struct type *ty);
+
+#endif