arm_adi_v5: Add ability to ignore the CSYSPWRUPACK bit

The CTRL/STAT register in the ARM DAP DP has a debug power up
ack bit and a system power up ack bit. Some devices do not set
the system power up ack bit until sometime later. To avoid having
the initial target examination fail due to this or to have a
sticky bit error report claim power failure due to this a user
can now specify that this bit should be ignored.

Change-Id: I2451234bbe904984e29562ef6f616cc6d6f60732
Signed-off-by: Eric Katzfey <eric.katzfey@mentalbee.com>
Signed-off-by: Matthias Welwarsky <matthias.welwarsky@sysgo.com>
Reviewed-on: http://openocd.zylin.com/3710
Tested-by: jenkins
Reviewed-by: Matthias Welwarsky <matthias@welwarsky.de>

src/target/arm_adi_v5.h

@@ -244,6 +244,10 @@ struct adiv5_dap {
 	 * should be performed before the next access.
 	 */
 	bool do_reconnect;
+
+	/** Flag saying whether to ignore the syspwrupack flag in DAP. Some devices
+	 *  do not set this bit until later in the bringup sequence */
+	bool ignore_syspwrupack;
 };
 
 /**