Kconfig: Relocate DEVICETREE symbol

Place config DEVICETREE after the sourced mainboard Kconfig.  This
gives the mainboard the opportunity to set a unique default value.

Change-Id: Id877e1e8f555334a99b6c0ee1782d06a4a2b7a04
Signed-off-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-on: https://review.coreboot.org/16493
Tested-by: build bot (Jenkins)
Reviewed-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-by: Martin Roth <martinroth@google.com>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
1 file changed