arm: vexpress: don't reset flags in board_init to avoid losing previous ones
Re-submitted because of missing description and signed-off.
flags reset in board_init caused bugs when executing command like editenv
because the reallocated flag was lost.
Tested-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Signed-off-by: Arnaud Aujon Chevallier <arnaud@intelibre.fr>