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 HÃ¥vard Skinnemoen.

Signed-off-by: Dirk Behme <dirk.behme@gmail.com>
diff --git a/lib_avr32/Makefile b/lib_avr32/Makefile
index cf20836..bb2938f 100644
--- a/lib_avr32/Makefile
+++ b/lib_avr32/Makefile
@@ -29,7 +29,7 @@
 
 SOBJS	= memset.o
 
-COBJS	= board.o interrupts.o avr32_linux.o div64.o
+COBJS	= board.o interrupts.o avr32_linux.o
 
 SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))