powerpc: fix ics_rtas_init and start_secondary section mismatch

It seems, we're fine with just annotating the two functions.
Thus, this fixes the following build warnings on ppc64:

WARNING: arch/powerpc/sysdev/xics/built-in.o(.text+0x1664):
The function .ics_rtas_init() references
the function __init .xics_register_ics().
This is often because .ics_rtas_init lacks a __init
annotation or the annotation of .xics_register_ics is wrong.

WARNING: arch/powerpc/sysdev/built-in.o(.text+0x6044):
The function .ics_rtas_init() references
the function __init .xics_register_ics().
This is often because .ics_rtas_init lacks a __init
annotation or the annotation of .xics_register_ics is wrong.

WARNING: arch/powerpc/kernel/built-in.o(.text+0x2db30):
The function .start_secondary() references
the function __cpuinit .vdso_getcpu_init().
This is often because .start_secondary lacks a __cpuinit
annotation or the annotation of .vdso_getcpu_init is wrong.

Cc: Benjamin Herrenschmidt <[e-mail]>
Signed-off-by: Daniel Borkmann <[e-mail]>
Signed-off-by: Benjamin Herrenschmidt <[e-mail]>

arch/powerpc/kernel/smp.c

···
 }
 
 /* Activate a secondary processor. */
-void start_secondary(void *unused)
+__cpuinit void start_secondary(void *unused)
 {
 	unsigned int cpu = smp_processor_id();
 	struct device_node *l2_cache;

arch/powerpc/sysdev/xics/ics-rtas.c

···
 	return !of_device_is_compatible(node, "chrp,iic");
 }
 
-int ics_rtas_init(void)
+__init int ics_rtas_init(void)
 {
 	ibm_get_xive = rtas_token("ibm,get-xive");
 	ibm_set_xive = rtas_token("ibm,set-xive");