build_sdk_board: setup distfiles dirs

Create these paths when creating the SDK instead of everytime
we unpack the SDK.

BUG=b:191307774
TEST=CQ passes

Change-Id: I52ca9abc39d19bc775281b353d018511f01afad6
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosutils/+/4861907
Reviewed-by: Sergey Frolov <sfrolov@google.com>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
1 file changed