8xxx: Refactored common cpu specific code for 85xx/86xx into one file.

Removed same code pieces from cpu/mpc85xx/cpu.c and cpu/mpc86xx/cpu.c
and moved to cpu/mpc8xxx/cpu.c(new file)

Signed-off-by: Poonam Aggrwal <poonam.aggrwal@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/Makefile b/Makefile
index 15866e8..c24df6b 100644
--- a/Makefile
+++ b/Makefile
@@ -229,10 +229,12 @@
 ifeq ($(CPU),mpc85xx)
 LIBS += drivers/qe/qe.a
 LIBS += cpu/mpc8xxx/ddr/libddr.a
+LIBS += cpu/mpc8xxx/lib8xxx.a
 TAG_SUBDIRS += cpu/mpc8xxx
 endif
 ifeq ($(CPU),mpc86xx)
 LIBS += cpu/mpc8xxx/ddr/libddr.a
+LIBS += cpu/mpc8xxx/lib8xxx.a
 TAG_SUBDIRS += cpu/mpc8xxx
 endif
 LIBS += drivers/rtc/librtc.a