[coreboot] qemu dts fixes

[Myles Watson]

This patch updates qemu.  It takes out the bus construct from the dts, adds
the dts for ide, isa, and acpi.  It changes the default for ide to enabled.
It makes it so that only the plugged in cards are dynamic.

Since it's harder in emulation to tell if chips are cards or on the
mainboard, I may be wrong with the VGA card.  Help?

Signed-off-by: Myles Watson <mylesgw at gmail.com>

Thanks,
Myles
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