Fix pin validate failure

Author: multiplemonomials

targets/TARGET_NUVOTON/TARGET_M480/TARGET_NUMAKER_PFM_M487/PinNames.h

@@ -69,16 +69,8 @@ typedef enum {
 
     // Note: board-specific
     // UART naming
-#if defined(MBED_CONF_TARGET_USB_UART_TX)
     CONSOLE_TX           = MBED_CONF_TARGET_USB_UART_TX,
-#else
-    CONSOLE_TX           = NC,
-#endif
-#if defined(MBED_CONF_TARGET_USB_UART_RX)
     CONSOLE_RX           = MBED_CONF_TARGET_USB_UART_RX,
-#else
-    CONSOLE_RX           = NC,
-#endif
 #if defined(MBED_CONF_TARGET_STDIO_UART_TX)
     STDIO_UART_TX   = MBED_CONF_TARGET_STDIO_UART_TX,
 #else