powerpc/book3e: move early_alloc_pgtable() to init section

early_alloc_pgtable() is only used during init.
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/mm/nohash/book3e_pgtable.c

@@ -55,7 +55,7 @@ void vmemmap_remove_mapping(unsigned long start,
 #endif
 #endif /* CONFIG_SPARSEMEM_VMEMMAP */
 
-static __ref void *early_alloc_pgtable(unsigned long size)
+static void __init *early_alloc_pgtable(unsigned long size)
 {
 	void *ptr;
 
@@ -74,7 +74,7 @@ static __ref void *early_alloc_pgtable(unsigned long size)
  * map_kernel_page adds an entry to the ioremap page table
  * and adds an entry to the HPT, possibly bolting it
  */
-int map_kernel_page(unsigned long ea, unsigned long pa, pgprot_t prot)
+int __ref map_kernel_page(unsigned long ea, unsigned long pa, pgprot_t prot)
 {
 	pgd_t *pgdp;
 	pud_t *pudp;