Convert CONFIG_BOOTCOUNT_LIMIT to Kconfig

This converts the following to Kconfig:
   CONFIG_BOOTCOUNT_LIMIT

Signed-off-by: Lukasz Majewski <lukma@denx.de>
Tested-by: Alex Kiernan <alex.kiernan@gmail.com>
Reviewed-by: Hannes Schmelzer <hannes.schmelzer@br-automation.com>
Acked-by: Hannes Schmelzer <hannes.schmelzer@br-automation.com>
diff --git a/configs/mx53ppd_defconfig b/configs/mx53ppd_defconfig
index ef61f14..90df425 100644
--- a/configs/mx53ppd_defconfig
+++ b/configs/mx53ppd_defconfig
@@ -22,6 +22,7 @@
 CONFIG_CMD_FAT=y
 CONFIG_CMD_FS_GENERIC=y
 CONFIG_BOOTCOUNT=y
+CONFIG_BOOTCOUNT_LIMIT=y
 CONFIG_BOOTCOUNT_EXT=y
 CONFIG_SYS_BOOTCOUNT_EXT_DEVPART="0:5"
 CONFIG_NETDEVICES=y