board: freescale: fix LS1021a build

Fix build error "undefined reference to `is_warm_boot'" when
ls1021atsn and ls1021atwr boards are built with CONFIG_SPL=y and
CONFIG_DEEP_SLEEP=n.

Signed-off-by: Benjamin Lemouzy <blemouzy@centralp.fr>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
2 files changed