[POWERPC] Add __init annotations to reserve_mem() and stabs_alloc()

reserve_mem() and stabs_alloc() are both called only from other __init
routines, so can be marked __init.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/mm/stab.c b/arch/powerpc/mm/stab.c
index eeeacab..132c6bc 100644
--- a/arch/powerpc/mm/stab.c
+++ b/arch/powerpc/mm/stab.c
@@ -227,7 +227,7 @@
  * the first (bolted) segment, so that do_stab_bolted won't get a
  * recursive segment miss on the segment table itself.
  */
-void stabs_alloc(void)
+void __init stabs_alloc(void)
 {
 	int cpu;