Make initialization of OF hooks dependent on PPC_OF, not on MULTIPLATFORM

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Index: arch/powerpc/kernel/head_32.S
===================================================================
--- a/arch/powerpc/kernel/head_32.S.orig
+++ b/arch/powerpc/kernel/head_32.S
@@ -119,7 +119,7 @@ __start:
  * because OF may have I/O devices mapped into that area
  * (particularly on CHRP).
  */
-#ifdef CONFIG_PPC_MULTIPLATFORM
+#ifdef CONFIG_PPC_OF
 	cmpwi	0,r5,0
 	beq	1f
 	bl	prom_init

--
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