x86: Convert a few mistaken __cpuinit annotations to __init

The first two are functions serving as initcalls; the SFI one is
only being called from __init code.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Link: http://lkml.kernel.org/r/50AFB35102000078000AAECA@nat28.tlf.novell.com


Signed-off-by: Ingo Molnar <mingo@kernel.org>