[U-Boot] Getting driver model running in SPL

Hi Tom,

Do you think we can apply the ARM SPL patch early in this merge window? There is your series for TI, then mine which sits on top. It is possible that something may break, but if we do it now then there is plenty of time to fix it.

I would really like to bring in the driver model SPL support and expand it to a few more boards. Then I'd like to get all the driver model stuff moved over to Kconfig.

Regards, Simon