fix warning with lpcopen

hw/mcu/nxp/lpc_chip_175x_6x/inc/lpc_types.h

@@ -82,10 +82,10 @@ typedef enum {
 } TRANSFER_BLOCK_T;
 
 /** Pointer to Function returning Void (any number of parameters) */
-typedef void (*PFV)(void);
+// typedef void (*PFV)();
 
 /** Pointer to Function returning int32_t (any number of parameters) */
-typedef int32_t (*PFI)(void);
+// typedef int32_t (*PFI)();
 
 /**
  * @}

hw/mcu/nxp/lpc_chip_175x_6x/src/clock_17xx_40xx.c

@@ -328,6 +328,7 @@ uint32_t Chip_Clock_GetSYSCLKRate(void)
 	case (uint32_t) SYSCTL_PLLCLKSRC_RTC:
 		return Chip_Clock_GetRTCOscRate();
 #endif
+        default: break;
 	}
 	return 0;
 }