[new uImage] Move PPC do_bootm_linux() to lib_ppc/ppc_linux.c

PPC implementation of do_bootm_linux() routine is moved to
a dedicated file lib_ppc/ppc_linux.c

Signed-off-by: Marian Balakowicz <m8@semihalf.com>
diff --git a/lib_ppc/Makefile b/lib_ppc/Makefile
index 2ba034f..2aa0154 100644
--- a/lib_ppc/Makefile
+++ b/lib_ppc/Makefile
@@ -28,7 +28,8 @@
 SOBJS	= ppcstring.o ticks.o
 
 COBJS	= board.o \
-	  bat_rw.o cache.o extable.o kgdb.o time.o interrupts.o
+	  bat_rw.o cache.o extable.o kgdb.o time.o interrupts.o \
+	  ppc_linux.o
 
 SRCS 	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))