boards/chromebook-elm: force checking hashes

Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Cc: Bilal Wasim <bilalwasim676@gmail.com>
Signed-off-by: Arnout Vandecappelle <arnout@mind.be>
(cherry picked from commit 3988f2d9238bc027b5d16219867e8d3c701c0c06)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
3 files changed