Merge branch 'fix/esp32p4_eco5_multicore_wfi_autoclock_gating_v5.5' into 'release/v5.5'

fix(esp_hw_support): enable core1 auto clock gating for esp32p4 rev3+ multicore (v5.5)

See merge request espressif/esp-idf!44256

components/esp_system/port/cpu_start.c

@@ -657,6 +657,10 @@ NOINLINE_ATTR static void system_early_init(const soc_reset_reason_t *rst_reas)
 
 #if SOC_CPU_CORES_NUM > 1 // there is no 'single-core mode' for natively single-core processors
 #if !CONFIG_ESP_SYSTEM_SINGLE_CORE_MODE
+#if CONFIG_IDF_TARGET_ESP32P4 && CONFIG_ESP32P4_REV_MIN_FULL >= 300
+    // Ensure autoclock gating mode for core1 is enabled, it gets disabled in single-core mode.
+    REG_SET_BIT(HP_SYS_CLKRST_CPU_WAITI_CTRL0_REG, HP_SYS_CLKRST_REG_CORE1_WAITI_ICG_EN);
+#endif
     start_other_core();
 #else
     ESP_EARLY_LOGI(TAG, "Single core mode");