enable the final slot

The debug uart is shared with slot 7, so in order to use sim slot 7 the
pin config and the uart config needs to be changed. Going back to using
the debug uart works by defining ENABLE_DBG_UART7

Change-Id: I8f3c7c60306941159c35307a5c1e38c2a2bd2fe1
diff --git a/sysmoOCTSIM/driver_init.h b/sysmoOCTSIM/driver_init.h
index de5e441..f9d23b7 100644
--- a/sysmoOCTSIM/driver_init.h
+++ b/sysmoOCTSIM/driver_init.h
@@ -36,7 +36,11 @@
 extern struct usart_async_descriptor SIM4;
 extern struct usart_async_descriptor SIM5;
 extern struct usart_async_descriptor SIM6;
+#ifdef ENABLE_DBG_UART7
 extern struct usart_async_rings_descriptor UART_debug;
+#else
+extern struct usart_async_descriptor SIM7;
+#endif
 
 void CALENDAR_0_CLOCK_init(void);
 void CALENDAR_0_init(void);
@@ -69,6 +73,10 @@
 void SIM6_CLOCK_init(void);
 void SIM6_init(void);
 
+void SIM7_PORT_init(void);
+void SIM7_CLOCK_init(void);
+void SIM7_init(void);
+
 void UART_debug_PORT_init(void);
 void UART_debug_CLOCK_init(void);
 void UART_debug_init(void);