Ensure that PSSCR is set to a safe value corresponding to no
state-loss each time a POWER9 CPU comes online.
Signed-off-by: NGautham R. Shenoy <ego@linux.vnet.ibm.com>
Acked-By: NMichael Neuling <mikey@neuling.org>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>