Previous changes have made it so these flags are never changed;
enforce this by making them const.
Signed-off-by: NNathan Lynch <nathanl@linux.ibm.com>
Reviewed-by: NSrikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200612051238.1007764-6-nathanl@linux.ibm.com