Move 64bit division from avr32 to generic lib

Move the 64bit division from lib_avr32 to lib_generic. With this, all boards can do_div/__div64_32 if needed, not only avr one. Code is put to lib_generic, so no larger memory footprint if not used. No code modifications. Thanks for proposal by H?vard Skinnemoen.

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Looks good, although I'm afraid it will break avr32 as it still expects to find div64.h under asm/. Could you include this change as well to avoid any breakage when it is merged?

index c9e0499..bef1f30 100644
@@ -20,8 +20,8 @@
  * MA 02111-1307 USA
  */
 #include <common.h>
+#include <div64.h>
 
-#include <asm/div64.h>
 #include <asm/errno.h>
 #include <asm/io.h>
 #include <asm/processor.h>