powerpc: Fix numa topology console print

With recent update to printk, we get console output like below:

[    0.550639] Brought up 160 CPUs
[    0.550718] Node 0 CPUs:
[    0.550721]  0
[    0.550754] -39

[    0.550794] Node 1 CPUs:
[    0.550798]  40
[    0.550817] -79

[    0.550856] Node 16 CPUs:
[    0.550860]  80
[    0.550880] -119

[    0.550917] Node 17 CPUs:
[    0.550923]  120
[    0.550942] -159

Fix this by properly using pr_cont(), ie. KERN_CONT.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>