Realtek: serial - line ending fix

One line had a window line ending

Author: 0xc0170

targets/TARGET_Realtek/TARGET_AMEBA/TARGET_RTL8195A/serial_api.c

@@ -327,7 +327,7 @@ void serial_irq_set(serial_t *obj, SerialIrq irq, uint32_t enable)
         if(enable) {
             if (irq == RxIrq) {
                 log_uart_irq_set(&stdio_uart_log, IIR_RX_RDY, enable);
-                serial_log_irq_en |= SERIAL_RX_IRQ_EN;
+                serial_log_irq_en |= SERIAL_RX_IRQ_EN;
             } else {
                 log_uart_irq_set(&stdio_uart_log, IIR_THR_EMPTY, enable);
                 serial_log_irq_en |= SERIAL_TX_IRQ_EN;