[SPARC64]: Add proper header file extern for cmdline_memory_size.

Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc64/mm/init.c

@@ -761,8 +761,6 @@ out:
 		smp_new_mmu_context_version();
 }
 
-extern unsigned long cmdline_memory_size;
-
 /* Find a free area for the bootmem map, avoiding the kernel image
  * and the initial ramdisk.
  */

include/asm-sparc64/pgtable.h

@@ -777,6 +777,8 @@ extern void pgtable_cache_init(void);
 extern void sun4v_register_fault_status(void);
 extern void sun4v_ktsb_register(void);
 
+extern unsigned long cmdline_memory_size;
+
 #endif /* !(__ASSEMBLY__) */
 
 #endif /* !(_SPARC64_PGTABLE_H) */