Clean up dataflash partitioning

This patch removes the board dependent parts from
"drivers/mtd/dataflash.c".
Each board relying on this, will have the appropriate
code in a new file, "partition.c" in the board directory.
board Makefiles updated to use the file.

The dataflash partitions are aligned on sector/page boundaries.

The CONFIG_NEW_DF_PARTITION was used to create named partitions
This is now the default operation, and the CONFIG variable is removed.

Signed-off-by: Ulf Samuelsson <ulf@atmel.com>
diff --git a/board/atmel/at91rm9200dk/Makefile b/board/atmel/at91rm9200dk/Makefile
index 01f3bc3..5b4cdcf 100755
--- a/board/atmel/at91rm9200dk/Makefile
+++ b/board/atmel/at91rm9200dk/Makefile
@@ -25,7 +25,7 @@
 
 LIB	= $(obj)lib$(BOARD).a
 
-COBJS	:= at91rm9200dk.o flash.o led.o mux.o
+COBJS	:= at91rm9200dk.o flash.o led.o mux.o partition.o
 
 SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(COBJS))