common: bootdelay: move CONFIG_BOOTDELAY into a Kconfig option

move CONFIG_BOOTDELAY into a Kconfig option. Used for this
purpose the moveconfig.py tool in tools.

Signed-off-by: Heiko Schocher <hs@denx.de>

Reviewed-by: Tom Rini <trini@konsulko.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Igor Grinberg <grinberg@compulab.co.il>
diff --git a/configs/maxbcm_defconfig b/configs/maxbcm_defconfig
index 7a5eeba..b67bc51 100644
--- a/configs/maxbcm_defconfig
+++ b/configs/maxbcm_defconfig
@@ -4,6 +4,7 @@
 CONFIG_TARGET_MAXBCM=y
 CONFIG_DEFAULT_DEVICE_TREE="armada-xp-maxbcm"
 CONFIG_SPL=y
+CONFIG_BOOTDELAY=3
 # CONFIG_CMD_IMLS is not set
 # CONFIG_CMD_FLASH is not set
 CONFIG_CMD_SF=y