os/arch/arm/src/amebasmart: fix pm sleep before loguart flush all data

1. there is no domain control for loguart tx irq previously, causing it to enter PG before all logs are printed correctly
2. add domain control similar to UART1, both LOGUART and UART1 shared the same domain.

os/arch/arm/src/amebasmart/amebasmart_serial.c

@@ -211,7 +211,8 @@
 
 static serial_t* sdrv[MAX_UART_INDEX + 1] = {NULL, NULL, NULL, NULL, NULL}; //uart 0~4, uart4 is configured as log uart
 #ifdef CONFIG_PM
-static bool uart_active_state = 0;
+static volatile bool uart_active_state = 0;
+static volatile bool log_uart_active_state = 0;
 #endif
 
 struct rtl8730e_up_dev_s {
@@ -767,6 +768,12 @@ static void rtl8730e_log_up_txint(struct uart_dev_s *dev, bool enable)
 	struct rtl8730e_up_dev_s *priv = (struct rtl8730e_up_dev_s *)dev->priv;
 	DEBUGASSERT(priv);
 	priv->txint_enable = enable;
+#ifdef CONFIG_PM
+	if (log_uart_active_state != enable) {	/* State has changed */
+		bsp_pm_domain_control(BSP_UART_DRV, enable);
+		log_uart_active_state = enable;
+	}
+#endif
 	if (enable) {
 		LOGUART_INTConfig(LOGUART_DEV, LOGUART_TX_EMPTY_PATH_4_INTR, ENABLE);
 		//LOGUART_RxCmd(LOGUART_DEV, ENABLE);