Add support for paravirtualization for sparc.

[Christian Mauderer]

Hello,

I'm still working on the XtratuM BSP. While the XtratuM specific part
has been rejected in it's current form, the part that is independent
from the hypervisor would simplify the development of other
hypervisor BSPs and eases the maintenance of this BSP (and possibly
similar BSPs) outside of the tree.

The code is testable with the current Sparc-BSPs due to the definition
of default functions for _SPARC_Get_PSR and so on in syscall.S. It is
only necessary to set the paravirt option for the normal BSP.

Kind regards,

Christian Mauderer

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Christian Mauderer
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