[POWERPC] Remove use of 4level-fixup.h for ppc32

For 32-bit systems, powerpc still relies on the 4level-fixup.h hack,
to pretend that the generic pagetable handling stuff is 3-levels
rather than 4.  This patch removes this, instead using the newer
pgtable-nopmd.h to handle the elision of both the pud and pmd
pagetable levels (ppc32 pagetables are actually 2 levels).

This removes a little extraneous code, and makes it more easily
compared to the 64-bit pagetable code.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/include/asm-powerpc/pgalloc-32.h b/include/asm-powerpc/pgalloc-32.h
index 235aef2..e130743 100644
--- a/include/asm-powerpc/pgalloc-32.h
+++ b/include/asm-powerpc/pgalloc-32.h
@@ -12,10 +12,10 @@
  * We don't have any real pmd's, and this code never triggers because
  * the pgd will always be present..
  */
-#define pmd_alloc_one(mm,address)       ({ BUG(); ((pmd_t *)2); })
+/* #define pmd_alloc_one(mm,address)       ({ BUG(); ((pmd_t *)2); }) */
 #define pmd_free(x)                     do { } while (0)
 #define __pmd_free_tlb(tlb,x)		do { } while (0)
-#define pgd_populate(mm, pmd, pte)      BUG()
+/* #define pgd_populate(mm, pmd, pte)      BUG() */
 
 #ifndef CONFIG_BOOKE
 #define pmd_populate_kernel(mm, pmd, pte)	\