This allows using wildcards with kconfig files so there is no need
to include individual files within a well define tree structure.
For example, you add
source "drivers/*/Kconfig"
and all Kconfig files under drivers/ will be sourced and the order in
menuconfig will be based on the wildcard processing, not in any particular
order.
The main advantage here is that drivers and platforms become drop-ins, a platform
or a driver can be added by just placing it in the right place without having to
change system Kconfig files or Makefiles (Makefiles will be supported in other change).
Change-Id: Id223ba10e6f48b4c48435e9ea37885162ce55e7c
Signed-off-by: Anas Nashif <anas.nashif@intel.com>