radeonfb: remove warning with CONFIG_PM=n

Remove warning from powerpc ppc64_defconfig builds:

drivers/video/aty/radeon_pm.c:30: warning: 'radeon_reinitialize_M10' declared 'static' but never defined

It's used only under CONFIG_PM, and only with CONFIG_X86 before it is
defined, so the forward declaration can be moved under the ifdef.

Signed-off-by: Olof Johansson <olof@lixom.net>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/video/aty/radeon_pm.c

@@ -27,8 +27,6 @@
 
 #include "ati_ids.h"
 
-static void radeon_reinitialize_M10(struct radeonfb_info *rinfo);
-
 /*
  * Workarounds for bugs in PC laptops:
  * - enable D2 sleep in some IBM Thinkpads
@@ -39,6 +37,8 @@ static void radeon_reinitialize_M10(struct radeonfb_info *rinfo);
  */
 
 #if defined(CONFIG_PM) && defined(CONFIG_X86)
+static void radeon_reinitialize_M10(struct radeonfb_info *rinfo);
+
 struct radeon_device_id {
         const char *ident;                     /* (arbitrary) Name */
         const unsigned short subsystem_vendor; /* Subsystem Vendor ID */