bootcount: add support for bootcounter on EXT filesystem

Add support for bootcounter on an EXT filesystem.
Sync configuration whitelist.

Signed-off-by: Ian Ray <ian.ray@ge.com>
Signed-off-by: Martyn Welch <martyn.welch@collabora.co.uk>
diff --git a/drivers/Kconfig b/drivers/Kconfig
index 613e602..c2e813f 100644
--- a/drivers/Kconfig
+++ b/drivers/Kconfig
@@ -10,6 +10,8 @@
 
 source "drivers/block/Kconfig"
 
+source "drivers/bootcount/Kconfig"
+
 source "drivers/clk/Kconfig"
 
 source "drivers/cpu/Kconfig"