powerpc: Fix up modules that should be including module.h

So that we can clean up the header files and not be relying
on implicit includes from device.h ---> module.h

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
diff --git a/arch/powerpc/platforms/cell/cbe_powerbutton.c b/arch/powerpc/platforms/cell/cbe_powerbutton.c
index f75a4da..2bb8031 100644
--- a/arch/powerpc/platforms/cell/cbe_powerbutton.c
+++ b/arch/powerpc/platforms/cell/cbe_powerbutton.c
@@ -21,6 +21,7 @@
  */
 
 #include <linux/input.h>
+#include <linux/module.h>
 #include <linux/platform_device.h>
 #include <asm/pmi.h>
 #include <asm/prom.h>