sparc64: fix section mismatch in find_numa_latencies_for_group

sparc64: fix section mismatch in find_numa_latencies_for_group

To fix:

  WARNING: vmlinux.o(.text.unlikely+0x580): Section mismatch in
  reference from the function find_numa_latencies_for_group() to the
  function .init.text:find_mlgroup()

  The function find_numa_latencies_for_group() references the
  function __init find_mlgroup().  This is often because
  find_numa_latencies_for_group lacks a __init annotation or the
  annotation of find_mlgroup is wrong.

It turns out find_numa_latencies_for_group is only called from:
    static int __init numa_parse_mdesc(void)
and hence we can tag find_numa_latencies_for_group with __init.

In doing so we see that find_best_numa_node_for_mlgroup is only
called from within __init and hence can also be marked with __init.

Cc: "David S. Miller" <[email protected]>
Cc: Nitin Gupta <[email protected]>
Cc: Chris Hyser <[email protected]>
Cc: Santosh Shilimkar <[email protected]>
Cc: [email protected]
Signed-off-by: Paul Gortmaker <[email protected]>
Signed-off-by: David S. Miller <[email protected]>