powerpc/mm: Fix definitions of FORCE_MAX_ZONEORDER in Kconfig

The current definitions set ranges and defaults for 32 and 64-bit
only using "PPC_STD_MMU" which means hash based MMU. This uselessly
restrict the usefulness for the upcoming 64-bit BookE port, but more
than that, it's broken on 32-bit since the only 32-bit platform
supporting multiple page sizes currently is 44x which does -not-
have PPC_STD_MMU_32 set.

This fixes it by using PPC64 and PPC32 instead.
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/Kconfig

@@ -492,16 +492,16 @@ endchoice
 
 config FORCE_MAX_ZONEORDER
 	int "Maximum zone order"
-	range 9 64 if PPC_STD_MMU_64 && PPC_64K_PAGES
-	default "9" if PPC_STD_MMU_64 && PPC_64K_PAGES
-	range 13 64 if PPC_STD_MMU_64 && !PPC_64K_PAGES
-	default "13" if PPC_STD_MMU_64 && !PPC_64K_PAGES
-	range 9 64 if PPC_STD_MMU_32 && PPC_16K_PAGES
-	default "9" if PPC_STD_MMU_32 && PPC_16K_PAGES
-	range 7 64 if PPC_STD_MMU_32 && PPC_64K_PAGES
-	default "7" if PPC_STD_MMU_32 && PPC_64K_PAGES
-	range 5 64 if PPC_STD_MMU_32 && PPC_256K_PAGES
-	default "5" if PPC_STD_MMU_32 && PPC_256K_PAGES
+	range 9 64 if PPC64 && PPC_64K_PAGES
+	default "9" if PPC64 && PPC_64K_PAGES
+	range 13 64 if PPC64 && !PPC_64K_PAGES
+	default "13" if PPC64 && !PPC_64K_PAGES
+	range 9 64 if PPC32 && PPC_16K_PAGES
+	default "9" if PPC32 && PPC_16K_PAGES
+	range 7 64 if PPC32 && PPC_64K_PAGES
+	default "7" if PPC32 && PPC_64K_PAGES
+	range 5 64 if PPC32 && PPC_256K_PAGES
+	default "5" if PPC32 && PPC_256K_PAGES
 	range 11 64
 	default "11"
 	help