adi_v5: search for Debug and Memory AP support

Adds dap_find_ap() function.

Change-Id: I6643025624009b12d4936de67a605da52c07be49
Signed-off-by: Evan Hunter <ehunter@broadcom.com>
Reviewed-on: http://openocd.zylin.com/909
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>

src/target/armv7a.h

@@ -99,6 +99,7 @@ struct armv7a_common {
 	uint32_t debug_base;
 	uint8_t debug_ap;
 	uint8_t memory_ap;
+	bool memory_ap_available;
 	/* mdir */
 	uint8_t multi_processor_system;
 	uint8_t cluster_id;