update/trees: reset xtree/tree_depend before build

in some cases, the build system was needlessly, and sometimes
erroneously, creating crossgcc symlinks, which then caused an
issue, namely:

in lbmk release builds, dell e6400 is build before fam15h boards,
and it sets xtree, but fam15h_rdimm doesn't, and later this would
cause fam15h_rdimm boards to use xtree="default" (because they don't
set xtree), causing the newer toolchain to be used on coreboot 4.11.

this patch fixes the issue. quite a simple problem, actually.

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

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