[U-Boot] [U-Boot,V2,05/10] spl: imx8: add spl boot device

[sbabic at denx.de]

> Add spl_boot_device for i.MX8, also add BOOT_DEVICE_MMC2_2 for
> spl_boot_mode.
> 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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