MLK-12483-3 mx6: Add a module fuse checking

Implement a functionality to read the soc fuses and check if any module
is fused. For fused module, we have to disable it in u-boot dynamically,
and change the its node in FDT to "disabled" status before starting the kernel.

In this patch, we implement the ft_system_setup for FDT fixup. This function will
be called during boot process or by "fdt systemsetup" command.

To enable the module fuse checking, two configurations must be defined:
CONFIG_MODULE_FUSE
CONFIG_OF_SYSTEM_SETUP

Signed-off-by: Ye Li <ye.li@nxp.com>

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