x86: Fix section annotation of acpi_map_cpu2node()

Commit 943bc7e1

 ("x86: Fix section warnings") added
__cpuinitdata here, while for functions __cpuinit should be
used.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Cc: <sp@numascale.com>
Link: http://lkml.kernel.org/r/4FA947910200007800082470@nat28.tlf.novell.com


Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Steffen Persvold <sp@numascale.com>