Adding support for the new FT231X IC from FTDI

To use it as a serial-USB bridge it's the same thing as a FT232 IC

UsbSerialExamples/res/xml/device_filter.xml

@@ -2,6 +2,9 @@
 <resources>
     <!-- 0x0403 / 0x6001: FTDI FT232R UART -->
     <usb-device vendor-id="1027" product-id="24577" />
+    
+    <!-- 0x0403 / 0x6015: FTDI FT231X -->
+    <usb-device vendor-id="1027" product-id="24597" />
 
     <!-- 0x2341 / Arduino -->
     <usb-device vendor-id="9025" />

UsbSerialLibrary/src/com/hoho/android/usbserial/driver/FtdiSerialDriver.java

@@ -540,6 +540,7 @@ public class FtdiSerialDriver extends CommonUsbSerialDriver {
         supportedDevices.put(Integer.valueOf(UsbId.VENDOR_FTDI),
                 new int[] {
                     UsbId.FTDI_FT232R,
+                    UsbId.FTDI_FT231X,                    
                 });
         return supportedDevices;
     }

UsbSerialLibrary/src/com/hoho/android/usbserial/driver/UsbId.java

@@ -31,6 +31,7 @@ public final class UsbId {
 
     public static final int VENDOR_FTDI = 0x0403;
     public static final int FTDI_FT232R = 0x6001;
+    public static final int FTDI_FT231X = 0x6015;
 
     public static final int VENDOR_ATMEL = 0x03EB;
     public static final int ATMEL_LUFA_CDC_DEMO_APP = 0x2044;