The DDR Alias address should be 0x40000000 according to RM, so correct
it.

Fixes: 4ab8f960 ("remoteproc: imx_rproc: support i.MX8MQ/M")
Reported-by: Terry Lv <terry.lv@nxp.com>
Reviewed-by: Iuliana Prodan <iuliana.prodan@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Daniel Baluta <daniel.baluta@nxp.com>
Link: https://lore.kernel.org/r/20240719-imx_rproc-v2-1-10d0268c7eb1@nxp.comSigned-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>