feat(esp_eth): a new folder structure of the driver and other improvements

Fixed memory leak in emac_esp_new_dma function.

Polished ESP EMAC cache management.

Added emac_periph definitions based on SoC features and improved(generalized) ESP EMAC GPIO
initialization.

Added ESP EMAC GPIO reservation.

Added check for frame error condition indicated by EMAC DMA and created a target test.

components/esp_eth/include/esp_eth_mac_openeth.h

@@ -0,0 +1,31 @@
+/*
+ * SPDX-FileCopyrightText: 2019-2024 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#pragma once
+
+#include "esp_eth_com.h"
+#include "esp_eth_mac.h"
+#include "sdkconfig.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if CONFIG_ETH_USE_OPENETH
+/**
+* @brief Create OpenCores Ethernet MAC instance
+*
+* @param config: Ethernet MAC configuration
+*
+* @return
+*      - instance: create MAC instance successfully
+*      - NULL: create MAC instance failed because some error occurred
+*/
+esp_eth_mac_t *esp_eth_mac_new_openeth(const eth_mac_config_t *config);
+#endif // CONFIG_ETH_USE_OPENETH
+
+#ifdef __cplusplus
+}
+#endif