When CONFIG_CHID is enabled, U-Boot must have access to a set of CHIDs
which it can use to identfy the hardware it is running on.
Add support for reading a hwids/compatible.hwidmap file in the board
directory and including the information in the board's devicetree.
This works by running the hwids_to_dtsi.py.py script and putting the
result in the dtsi_include_list variable.
Signed-off-by: Simon Glass <sjg@chromium.org>
a9e04b5d36