lava_helper_configs.py: Re-enable NXP board LAVA test

Since the blocked issue has been solved, reenable the LAVA test for the
LPCXpresso55s69 board.

Signed-off-by: Arthur She <arthur.she@linaro.org>
Change-Id: Ib904c93136d764c897151fc9c65676b39e0f3e30
1 file changed