powerpc/powernv/npu: Don't explicitly flush nmmu tlb
The nest mmu required an explicit flush as a tlbi would not flush it in the same way as the core. However an alternate firmware fix exists which should eliminate the need for this flush, so instead add a device-tree property (ibm,nmmu-flush) on the NVLink2 PHB to enable it only if required. Signed-off-by: Alistair Popple <alistair@popple.id.au> Reviewed-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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