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/Kconfig b/drivers/bootcount/Kconfig
index 8c19ae6..e0d1fc2 100644
--- a/drivers/bootcount/Kconfig
+++ b/drivers/bootcount/Kconfig
@@ -13,6 +13,7 @@
 choice
 	prompt "Boot count device"
 	default BOOTCOUNT_AM33XX if AM33XX || SOC_DA8XX
+	default BOOTCOUNT_AT91 if AT91SAM9XE
 
 config BOOTCOUNT_EXT
 	bool "Boot counter on EXT filesystem"
@@ -55,6 +56,10 @@
 	                              the bootcounter.
 	  CONFIG_BOOTCOUNT_ALEN = address len
 
+config BOOTCOUNT_AT91
+	bool "Boot counter for Atmel AT91SAM9XE"
+	depends on AT91SAM9XE
+
 endchoice
 
 config SYS_BOOTCOUNT_SINGLEWORD