Current CFGDATA item can only be displayed under one single page
defined in YAML. In some special case it might need to duplicate
the same item under a differnt page. This patch added this feature
by introducing a new "altpage" attribute for a CFG item. When a
item needs to be displayed on a 2nd page, 'altpage' can be added
to indicate the 2nd page id.
Signed-off-by: Maurice Ma <maurice.ma@intel.com>
2d775da9b4