microblaze: use the generic lib/checksum.c

The microblaze checksum code is mostly identical to
the asm-generic+lib version, so use that instead.

Signed-off-by: Remis Lima Baima <remis.developer@googlemail.com>
Signed-off-by: Michal Simek <monstr@monstr.eu>
diff --git a/arch/microblaze/lib/Makefile b/arch/microblaze/lib/Makefile
index 71c8cb6..b579db0 100644
--- a/arch/microblaze/lib/Makefile
+++ b/arch/microblaze/lib/Makefile
@@ -2,7 +2,7 @@
 # Makefile
 #
 
-lib-y :=  memset.o checksum.o
+lib-y :=  memset.o
 
 ifeq ($(CONFIG_OPT_LIB_ASM),y)
 lib-y += fastcopy.o