trees: move dependency building to new function

configure_project is a bit big. move the dependencies
build logic to a new function.

it may be desirable in future to make the way that
function works the way all build commands are done.

for example:

./update trees -b coreboot x230_12mb

would become:

./update trees -b coreboot/x230_12mb

this would enable to mix and match multi/single tree
projects. for now, leave things as they are.

Signed-off-by: Leah Rowe <leah@libreboot.org>

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