PATCH] unify pfn_to_page take 2 [4/25] powerpc funcs

It looks powerpc doesn't have DISCONTIGMEM config.
Just replace FLATMEM ver.

Signed-Off-By: KAMEZAWA Hiroyuki <redacted>

Index: test-layout-free-zone/include/asm-powerpc/page.h
===================================================================

--- test-layout-free-zone.orig/include/asm-powerpc/page.h
+++ test-layout-free-zone/include/asm-powerpc/page.h

@@ -69,8 +69,6 @@
  #endif

  #ifdef CONFIG_FLATMEM
-#define pfn_to_page(pfn)	(mem_map + (pfn))
-#define page_to_pfn(page)	((unsigned long)((page) - mem_map))
  #define pfn_valid(pfn)		((pfn) < max_mapnr)
  #endif