simtrace: add support for sniffing on both USART

Change-Id: I69eb458e7cb186c990e5d6fbc780f37fdd0cd884
diff --git a/firmware/libcommon/include/simtrace.h b/firmware/libcommon/include/simtrace.h
index e39d1dc..278d5d2 100644
--- a/firmware/libcommon/include/simtrace.h
+++ b/firmware/libcommon/include/simtrace.h
@@ -109,6 +109,7 @@
 
 /*  IRQ functions   */
 extern void Sniffer_usart0_irq(void);
+extern void Sniffer_usart1_irq(void);
 extern void mode_cardemu_usart0_irq(void);
 extern void mode_cardemu_usart1_irq(void);