ppc: Don't update NIP in facility unavailable interrupts
This is no longer necessary as the helpers will properly retrieve the return address when needed. Also remove gen_update_current_nip() which didn't seem to make much sense to me. Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>
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