Integrate AT91 bootcount driver

Integrate Boot counter for Atmel AT91SAM9XE into Kconfig

Reviewed-by: Lukasz Majewski <lukma@denx.de>
Signed-off-by: Alex Kiernan <alex.kiernan@gmail.com>
diff --git a/drivers/bootcount/Makefile b/drivers/bootcount/Makefile
index 62bf55e..a3658c1 100644
--- a/drivers/bootcount/Makefile
+++ b/drivers/bootcount/Makefile
@@ -3,7 +3,7 @@
 #
 
 obj-y				+= bootcount.o
-obj-$(CONFIG_AT91SAM9XE)	+= bootcount_at91.o
+obj-$(CONFIG_BOOTCOUNT_AT91)	+= bootcount_at91.o
 obj-$(CONFIG_BOOTCOUNT_AM33XX)	+= bootcount_davinci.o
 obj-$(CONFIG_BOOTCOUNT_RAM)	+= bootcount_ram.o
 obj-$(CONFIG_BOOTCOUNT_ENV)	+= bootcount_env.o