lwip: Rename esp32 port layer to esp32xx

As it reflects all chips from esp32-xx family, not only esp32

components/lwip/port/esp32xx/include/arch/perf.h

@@ -0,0 +1,12 @@
+/*
+ * SPDX-FileCopyrightText: 2001 Swedish Institute of Computer Science
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+#ifndef __PERF_H__
+#define __PERF_H__
+
+#define PERF_START    /* null definition */
+#define PERF_STOP(x)  /* null definition */
+
+#endif /* __PERF_H__ */