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/atmel_start_pins.h b/sysmoOCTSIM/atmel_start_pins.h
index 7cbaed5..0c33536 100644
--- a/sysmoOCTSIM/atmel_start_pins.h
+++ b/sysmoOCTSIM/atmel_start_pins.h
@@ -60,6 +60,7 @@
 #define SWITCH GPIO(GPIO_PORTC, 14)
 #define MUX_STAT GPIO(GPIO_PORTC, 15)
 #define SIM6_IO GPIO(GPIO_PORTC, 16)
+#define SIM7_IO GPIO(GPIO_PORTB, 21)
 #define USER_LED GPIO(GPIO_PORTC, 26)
 #define SCL4 GPIO(GPIO_PORTC, 27)
 #define SDA4 GPIO(GPIO_PORTC, 28)