arm_adi_v5: Remove all cases of "restoring" previous dap_ap_select()

arm_adi_v5: Remove all cases of "restoring" previous dap_ap_select()

All AP operations should select the AP to use before calling it so
there's no point in restoring the previous value afterwards.

The explicit call to dap_ap_select() before all AP operations should be
moved into dap_queue_ap_read/write() which then would have to take the
AP as an argument instead of the DAP.

Change-Id: Icacb0c76ef2a5ac36b4d2f26b52ec01a8850286e
Signed-off-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>
Reviewed-on: http://openocd.zylin.com/3156
Tested-by: jenkins
Reviewed-by: Matthias Welwarsky <matthias@welwarsky.de>