imx: iamge-container: support secondary container

Add the support for loading image from secondary container set on
iMX8QM B0, iMX8QXP C0.

Using the SCFW API to get container set index, if it is the secondary
boot, get the offset from fuse and apply to offset of current container
set beginning for loading.

Also override the emmc boot partition to check secondary boot and switch
to the other boot part.

This patch is modified from NXP downstream:
imx8: Fix the fuse used by secondary container offset
imx: container: Skip container set check for ROM API
imx8: spl: Support booting from secondary container set

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