[U-Boot] Add FIT support for spl_nor

[York Sun]

Guys,

I want to know if anyone is actively working on adding FIT support for
SPL NOR. I have made some improvement (pending upstreaming) for
LS1046ARDB QSPI boot. My target is to have falcon mode enabled for QSPI.
This will give one dedicated example to use falcon mode with QSPI
(SD/eMMC is already supported, but not enabled by default).

If no one is working on SPL NOR code, I will add FIT support.

York