acpi: downgrade files from module.h to export.h where possible.

If a file is only exporting symbols and not using the core
modular infrastructure, it can get by with just including
the smaller export.h header, which is a lot smaller than the
module.h header.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

drivers/acpi/atomicio.c

@@ -24,7 +24,7 @@
  */
 
 #include <linux/kernel.h>
-#include <linux/module.h>
+#include <linux/export.h>
 #include <linux/init.h>
 #include <linux/acpi.h>
 #include <linux/io.h>