change(ldo): make ldo driver unit_id same as datasheet

Prior to this commit, we expect passing ldo_unit_t to esp_ldo driver
`ldo_unit` field. And ldo_unit_t will alias the LDO unit to values
starting from 0, e.g. LDO_UNIT_1 is actually value 0.

With this commit, esp_ldo driver `ldo_unit` field will start with 1,
which is aligned with the datasheet. So LDO_UNIT_1 is in value 1,
meanwhile setting 1 to `ldo_unit` will work as well.

components/hal/esp32p4/include/hal/ldo_ll.h

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2023-2024 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -54,6 +54,17 @@ extern "C" {
  */
 #define LDO_ID2UNIT(ldo_id)    ((ldo_id) - 1)
 
+/**
+ * @brief Check if a LDO ID is valid
+ *
+ * @return True for valid
+ */
+__attribute__((always_inline))
+static inline bool ldo_ll_is_valid_ldo_id(int ldo_id)
+{
+    return ((ldo_id > 0) && (ldo_id <= LDO_LL_UNIT_NUM));
+}
+
 /**
  * @brief Enable a LDO
  *