Add private header for ARM11 internals.

Reduces confusion about location of associated routines and
reduces clutter in the arm11 header.

Removes extra whitespace around the lines touched by these changes.

src/target/arm11.c

@@ -27,6 +27,7 @@
 #endif
 
 #include "arm11.h"
+#include "arm11_dbgtap.h"
 #include "armv4_5.h"
 #include "arm_simulator.h"
 #include "time_support.h"