ppc/spapr: Ignore common "ibm,nmi-interlock" Linux bug

Linux kernels call "ibm,nmi-interlock" in their system reset handlers
contrary to PAPR. Returning an error because the CPU does not hold the
interlock here causes Linux to print warning messages. PowerVM returns
success in this case, so do the same for now.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Message-Id: <20200316142613.121089-9-npiggin@gmail.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
1 file changed