[U-Boot] imx8qxp: mek: enable dm-spl for pm

[sbabic at denx.de]

> with u-boot,dm-spl added for imx8qx-pm node, and SPL_SIMPLE_BUS enabled,
> the bind and probe code in board file could be removed.
> Also we need to enlarge SYS_MALLOC_F_LEN to avoid calloc fail.
> Signed-off-by: Peng Fan <peng.fan at nxp.com>

Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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