[POWERPC] Move declaration of tce variables into mmu-hash64.h

... instead of having extern declarations in a .c file.
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/mm/hash_utils_64.c

@@ -509,8 +509,6 @@ void __init htab_initialize(void)
 	unsigned long base = 0, size = 0, limit;
 	int i;
 
-	extern unsigned long tce_alloc_start, tce_alloc_end;
-
 	DBG(" -> htab_initialize()\n");
 
 	/* Initialize segment sizes */

include/asm-powerpc/mmu-hash64.h

@@ -181,6 +181,7 @@ extern int mmu_io_psize;
 extern int mmu_kernel_ssize;
 extern int mmu_highuser_ssize;
 extern u16 mmu_slb_size;
+extern unsigned long tce_alloc_start, tce_alloc_end;
 
 /*
  * If the processor supports 64k normal pages but not 64k cache