x86: fix section mismatch warning in process_*.c

Fix the following warning:
WARNING: arch/x86/kernel/built-in.o(.text+0x3): Section mismatch: reference to .cpuinit.data:force_mwait in 'mwait_usable'
[Seen on 64 bit only but similar pattern exist on 32 bit so fix it there too]

mwait_usable() were only used by a function annotated __cpuinit
so annotate mwait_usable() with __cpuinit to fix the warning.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

arch/x86/kernel/process_32.c

@@ -285,7 +285,7 @@ static void mwait_idle(void)
 	mwait_idle_with_hints(0, 0);
 }
 
-static int mwait_usable(const struct cpuinfo_x86 *c)
+static int __cpuinit mwait_usable(const struct cpuinfo_x86 *c)
 {
 	if (force_mwait)
 		return 1;

arch/x86/kernel/process_64.c

@@ -281,7 +281,7 @@ static void mwait_idle(void)
 }
 
 
-static int mwait_usable(const struct cpuinfo_x86 *c)
+static int __cpuinit mwait_usable(const struct cpuinfo_x86 *c)
 {
 	if (force_mwait)
 		return 1;