plat: imx8mm: mask the non-wakeup irq in low power mode

Only enable the wakeup irq when system enter DSM mode.

Signed-off-by: Bai Ping <ping.bai@nxp.com>
(cherry picked from commit 7b9b62cff3816e2196d1d9c94d8c95eedda96dec)
1 file changed