Re-add Lazarus (Bush IBX settop) support
This is independent of the other Bush IBX merge requests I've submitted, and should not affect non-IBX (Lazarus) platforms.
Minor changes to hdr/CPU/Arch to correctly set up the CPU type flags for Bush IBX settops. Also changes to hdr/Machine/Machine to recognise the "Lazarus" machinetype as an IOMD variant. (because ARM7500FE is an SoC with an FPA-enabled ARM7 with VIDC and IOMD on a single chip)