sniff: use USART 0 instead of USART 1

Use USART 0 connected to the SIM card side to sniff the communication.
The card side can also measure ETU times.
Do proper pin initialization.
This code can already capture the ATR communication between phone and card.

firmware/apps/trace/main.c

@@ -54,7 +54,7 @@ static const conf_func config_func_ptrs[] = {
 		.init = Sniffer_init,
 		.exit = Sniffer_exit,
 		.run = Sniffer_run,
-		.usart1_irq = Sniffer_usart1_irq,
+		.usart0_irq = Sniffer_usart0_irq,
 	},
 #endif
 #ifdef HAVE_CCID
@@ -165,8 +165,7 @@ extern int main(void)
 		   g_unique_id[0], g_unique_id[1],
 		   g_unique_id[2], g_unique_id[3]);
 	TRACE_INFO("Reset Cause: 0x%x\n\r", (RSTC->RSTC_SR & RSTC_SR_RSTTYP_Msk) >> RSTC_SR_RSTTYP_Pos);
-
-	TRACE_INFO("cfg %d\n\r", simtrace_config);
+	TRACE_INFO("USB configuration used: %d\n\r", simtrace_config);
 
 	board_main_top();