[U-Boot] fdtgrep exclude nodes

Hi Simon and Stefan,

I was checking spl/u-boot-spl.dtb and I see that you are removing interrupt-parent property but I think that also make sense to remove interrupt property as well because it is unused and parent is also removed. Just extend OF_SPL_REMOVE_PROPS by "interrupts" to save some memory.

Another thing I was checking was that we are missing rules for removing nodes with status = "disabled" property. I think that will be good to add it. The reason is that I would move all that u-boot,dm-pre-reloc to dtsi at least for now. Or do you also probe drivers for nodes which have status disabled?

Thanks, Michal