powerpc/powernv/vas: Define helpers to init window context
Define helpers to initialize window context registers of the VAS hardware. These will be used in follow-on patches when opening/closing VAS windows. Signed-off-by: NSukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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