trees: set btype if target.cfg doesn't exist

set it to "auto", because otherwise it'll be unset,
which means that kconfig type is assumed.

the build system is designed in such a way that multi-tree
is assumed, if the target build system uses kconfig files.

target.cfg is optional on single-tree but not multi-tree,
so it's ok to set something here.

basically, kconfig-type projects will never be single-tree.

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

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