The LPAV is not allocated to APD when dual boot, so LPAV won't
reset when APD is reset. We have to explicitly reset the DDR,
otherwise its initialization will fail.

Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Ye Li <ye.li@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>