powerpc/mm: Move hash64 PTE bits from book3s/64/pgtable.h to hash.h

This enables us to keep hash64 related bits together, and makes it easy
to follow.
Acked-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/include/asm/pgtable.h

@@ -18,12 +18,6 @@ struct mm_struct;
 #include <asm/pgtable-book3e.h>
 #endif /* !CONFIG_PPC_BOOK3S */
 
-/*
- * We save the slot number & secondary bit in the second half of the
- * PTE page. We use the 8 bytes per each pte entry.
- */
-#define PTE_PAGE_HIDX_OFFSET (PTRS_PER_PTE * 8)
-
 #ifndef __ASSEMBLY__
 
 #include <asm/tlbflush.h>