targets: Print nested ROM tables with the 'dap info' command.

targets: Print nested ROM tables with the 'dap info' command.

Move the ROM table printing into a separate function to allow
recursive calls with nested tables. ROM tables can nest. The
printing is limited to 16 levels.

Update the types of tables printed. When an entry can't be read, print
a warning and continue.

Change-Id: Ib134edd9e987af2f5f606071521885b17af4d70f
Signed-off-by: Chris Johns <chrisj@rtems.org>
Reviewed-on: http://openocd.zylin.com/1427
Tested-by: jenkins
Reviewed-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>