microblaze: Add {z,}alloc_maybe_bootmem functions

I will need {z,}alloc_maybe_bootmem functions for pci patches

Signed-off-by: Michal Simek <monstr@monstr.eu>
diff --git a/arch/microblaze/include/asm/system.h b/arch/microblaze/include/asm/system.h
index 15797068..59efb3f 100644
--- a/arch/microblaze/include/asm/system.h
+++ b/arch/microblaze/include/asm/system.h
@@ -87,6 +87,9 @@
 extern char *klimit;
 extern void ret_from_fork(void);
 
+extern void *alloc_maybe_bootmem(size_t size, gfp_t mask);
+extern void *zalloc_maybe_bootmem(size_t size, gfp_t mask);
+
 #ifdef CONFIG_DEBUG_FS
 extern struct dentry *of_debugfs_root;
 #endif