[U-Boot] [PATCH v2 4/6] moveconfig: Add a constant for auto.conf

[sjg at google.com]

This filename is used a few times. Move it to a constant before adding
further uses.

Signed-off-by: Simon Glass <sjg at chromium.org>
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Changes in v2: None

 tools/moveconfig.py | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

Applied to u-boot-dm, thanks!