io_mux: can set different clock source

components/esp_hw_support/port/esp32c2/io_mux.c

@@ -0,0 +1,13 @@
+/*
+ * SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "esp_private/io_mux.h"
+
+esp_err_t io_mux_set_clock_source(soc_module_clk_t clk_src)
+{
+    // IO MUX clock source is not selectable
+    return ESP_OK;
+}