refactor(etm): move ETM retention info from HAL to driver layer

Move soc_etm_retention_desc_t type definition and soc_etm_retention_info
data from hal component to esp_hw_support component, following the
pattern of other peripheral retention data (e.g. MWDT).

- Create esp_private/etm_retention.h with type and extern declaration
- Create port/<target>/etm_retention.c for each target with retention data
- Remove hal/<target>/etm_periph.c and hal/include/hal/etm_periph.h
- Update esp_etm.c to include the new header
- Update CMakeLists.txt in both components

components/hal/include/hal/etm_periph.h

@@ -1,39 +0,0 @@
-/*
- * SPDX-FileCopyrightText: 2023-2025 Espressif Systems (Shanghai) CO LTD
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-
-#pragma once
-
-#include <stdint.h>
-#include "soc/soc_caps.h"
-#include "soc/regdma.h"
-
-#if SOC_HAS(ETM)
-#include "hal/etm_ll.h"
-#endif
-
-#if SOC_HAS(PAU)
-#include "soc/retention_periph_defs.h"
-#endif
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#if SOC_HAS(PAU) && SOC_ETM_SUPPORT_SLEEP_RETENTION
-
-typedef struct {
-    periph_retention_module_t module;                  // ID of the ETM as a retention module
-    const regdma_entries_config_t *regdma_entry_array; // Array of regdma entries for retention
-    uint32_t array_size;                               // Size of the regdma_entry_array
-} soc_etm_retention_desc_t;
-
-extern const soc_etm_retention_desc_t soc_etm_retention_info[ETM_LL_GET(INST_NUM)];
-
-#endif // SOC_HAS(PAU)
-
-#ifdef __cplusplus
-}
-#endif