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>

arch/powerpc/sysdev/pmi.c

@@ -28,6 +28,7 @@
 #include <linux/slab.h>
 #include <linux/completion.h>
 #include <linux/spinlock.h>
+#include <linux/module.h>
 #include <linux/workqueue.h>
 #include <linux/of_device.h>
 #include <linux/of_platform.h>