Blackfin arch: use do_div() for the 64bit division as pointed out by Bernd

If you need a 64 bit divide in the kernel, use asm/div64.h.
Revert the addition of udivdi3.

Cc: Bernd Schmidt <bernd.schmidt@analog.com>
Signed-off-by: Mike Frysinger <michael.frysinger@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>

diff --git a/arch/blackfin/lib/Makefile b/arch/blackfin/lib/Makefile
index bfdad52..635288f 100644
--- a/arch/blackfin/lib/Makefile
+++ b/arch/blackfin/lib/Makefile
@@ -4,7 +4,7 @@
 
 lib-y := \
 	ashldi3.o ashrdi3.o lshrdi3.o \
-	muldi3.o divsi3.o udivsi3.o udivdi3.o modsi3.o umodsi3.o \
+	muldi3.o divsi3.o udivsi3.o modsi3.o umodsi3.o \
 	checksum.o memcpy.o memset.o memcmp.o memchr.o memmove.o \
 	strcmp.o strcpy.o strncmp.o strncpy.o \
 	umulsi3_highpart.o smulsi3_highpart.o \