ARM: remove duplicated code for LaCie boards

This patch groups together all the common functions for LaCie boards:
Ethernet PHY and MAC address initializations.

Moreover the configurations for LaCie Kirkwood boards are merged into
a single file: include/configs/lacie_kw.h

Signed-off-by: Simon Guinot <simon.guinot@sequanux.org>
diff --git a/board/LaCie/net2big_v2/Makefile b/board/LaCie/net2big_v2/Makefile
index 4bacef4..fbae48e 100644
--- a/board/LaCie/net2big_v2/Makefile
+++ b/board/LaCie/net2big_v2/Makefile
@@ -21,10 +21,13 @@
 #
 
 include $(TOPDIR)/config.mk
+ifneq ($(OBJTREE),$(SRCTREE))
+$(shell mkdir -p $(obj)../common)
+endif
 
 LIB	= $(obj)lib$(BOARD).o
 
-COBJS	:= net2big_v2.o
+COBJS	:= $(BOARD).o ../common/common.o
 
 SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(COBJS))