configs: at91sam9rlek: Update for DT and DM support

Update the configuration files to support the device tree and driver
model. The device clock and pins configuration are handled by the
clock and the pinctrl drivers respectively.

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/board/atmel/at91sam9rlek/Makefile b/board/atmel/at91sam9rlek/Makefile
index 51daf8d..7acfee5 100644
--- a/board/atmel/at91sam9rlek/Makefile
+++ b/board/atmel/at91sam9rlek/Makefile
@@ -10,5 +10,5 @@
 #
 
 obj-y += at91sam9rlek.o
-obj-y += led.o
+obj-$(CONFIG_AT91_LED) += led.o
 obj-$(CONFIG_HAS_DATAFLASH) += partition.o