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>
diff --git a/lib/md5.c b/lib/md5.c
index c777180..958a3c1 100644
--- a/lib/md5.c
+++ b/lib/md5.c
@@ -1,5 +1,5 @@
 #include <linux/kernel.h>
-#include <linux/module.h>
+#include <linux/export.h>
 #include <linux/cryptohash.h>
 
 #define F1(x, y, z)	(z ^ (x & (y ^ z)))