add the new UART definition according to the new SDK

Author: josuah

Firmware/pico-ice-default/tusb_config.h

@@ -55,6 +55,10 @@
 #define ICE_USB_USE_DEFAULT_DFU     1
 #define ICE_USB_USE_TINYUF2_MSC     1
 
+// Configure forwarding between USB CDC and UART
+#define ICE_USB_UART_CDC            1
+#define ICE_USB_UART_NUM            0
+
 // CDC FIFO size of TX and RX and Endpoint buffer size
 #define CFG_TUD_CDC_RX_BUFSIZE      512
 #define CFG_TUD_CDC_TX_BUFSIZE      512