lib: reduce the use of module.h wherever possible

For files only using THIS_MODULE and/or EXPORT_SYMBOL, map
them onto including export.h -- or if the file isn't even
using those, then just delete the include.  Fix up any implicit
include dependencies that were being masked by module.h along
the way.

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

lib/irq_regs.c

@@ -8,7 +8,8 @@
  * as published by the Free Software Foundation; either version
  * 2 of the License, or (at your option) any later version.
  */
-#include <linux/module.h>
+#include <linux/export.h>
+#include <linux/percpu.h>
 #include <asm/irq_regs.h>
 
 #ifndef ARCH_HAS_OWN_IRQ_REGS