am33xx: move ti i2c baseboard header handling to board/ti/am335x/

The i2c header is specific to ti(-derived) boards, and not generic for all
am335x boards.

Signed-off-by: Peter Korsgaard <peter.korsgaard@barco.com>
[trini: Make re-apply with rtc32k_enable() applied]
Signed-off-by: Tom Rini <trini@ti.com>
diff --git a/board/ti/am335x/Makefile b/board/ti/am335x/Makefile
index ca50eef..67a87a1 100644
--- a/board/ti/am335x/Makefile
+++ b/board/ti/am335x/Makefile
@@ -22,6 +22,7 @@
 COBJS	:= mux.o
 endif
 
+COBJS	+= board.o
 SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(COBJS))
 SOBJS	:= $(addprefix $(obj),$(SOBJS))