dts: 2712: Drop some numa options from bootargs

[popcornmix]

iommu_dma_numa_policy=interleave is not valid in the current tree It generates an unknown setting will be passed to usespace warning

system_heap.max_order=0 is wanted when numa is enabled, but may not be when it is disabled.

Add it on firmware side when we know if numa=fake=<n> is used.

[popcornmix]

Draft until bootloader side is merged and available.

[popcornmix]

Bootloader should now do this, so marking this as ready.

[pelwell]

You'll need to resolve the merge conflict.

[popcornmix]

Rebased