reef: Add a print to indicate board version.
reef: Add a print to indicate board version.

This just adds a print statement to display board version at the
EC console the first time board_get_version() is called.

BUG=none
BRANCH=none
TEST=print shows up as expected with follow-up patches applied.

Change-Id: Ib7eae79a90bdaa58165aa5b102bc446f21a98963
Signed-off-by: David Hendricks <3b0deacc4b5357f519084f1ea34bd42bf5d34545@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/358910
Reviewed-by: Aaron Durbin <af0622ab041e8b0f8e5819838dcc93898196e71f@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec