soc_caps: enable SOC_PM_SUPPORT_RTC_PERIPH_PD

components/soc/esp32c6/include/soc/Kconfig.soc_caps.in

@@ -1103,6 +1103,10 @@ config SOC_PM_SUPPORT_MAC_BB_PD
     bool
     default y
 
+config SOC_PM_SUPPORT_RTC_PERIPH_PD
+    bool
+    default y
+
 config SOC_PM_SUPPORT_PMU_MODEM_STATE
     bool
     default y

components/soc/esp32c6/include/soc/soc_caps.h

@@ -454,6 +454,7 @@
 #define SOC_PM_SUPPORT_VDDSDIO_PD       (1)
 #define SOC_PM_SUPPORT_TOP_PD           (1)
 #define SOC_PM_SUPPORT_MAC_BB_PD        (1)
+#define SOC_PM_SUPPORT_RTC_PERIPH_PD    (1)
 
 #define SOC_PM_SUPPORT_PMU_MODEM_STATE  (1)
 /* macro redefine for pass esp_wifi headers md5sum check */