Hob: improve recipe/package selection performance

Hob: improve recipe/package selection performance

Originally we will send selection chagned notification in each
include_item and exclude_item, which is time cost since these are
recursive functions and we may select hundreds of recipes/packages.

The improvement is to move the notification from include_item and
exclude_item to the place where the two functions are called.
This could greatly improve the selection/deselection speed for recipe
and package lists.

(Bitbake rev: 5ad7c54f4b8739b9ae097c68978093a53f950ed7)

Signed-off-by: Dongxiao Xu <dongxiao.xu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>