arm_adi_v5: Convert the AP references from numbers to pointers

Change the debug_ap and memory_ap fields of the cortex_a target and
the debug_ap field of the cortex_m target to be pointers to the
struct adiv5_ap instead of AP numbers in some known DAP.

This reduces the dependency on the DAP struct in the targets and
enables MEM-AP accesses to take the relevant AP as parameter.

Change-Id: I39d7b134d78000564b7eec5bff464adf0ef89147
Signed-off-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>
Reviewed-on: http://openocd.zylin.com/3147
Tested-by: jenkins
Reviewed-by: Matthias Welwarsky <matthias@welwarsky.de>

src/target/armv7a.h

@@ -107,8 +107,8 @@ struct armv7a_common {
 	/* Core Debug Unit */
 	struct arm_dpm dpm;
 	uint32_t debug_base;
-	uint8_t debug_ap;
-	uint8_t memory_ap;
+	struct adiv5_ap *debug_ap;
+	struct adiv5_ap *memory_ap;
 	bool memory_ap_available;
 	/* mdir */
 	uint8_t multi_processor_system;