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/kmlion1_defconfig b/configs/kmlion1_defconfig
index 1a7d311..bedea17 100644
--- a/configs/kmlion1_defconfig
+++ b/configs/kmlion1_defconfig
@@ -31,6 +31,7 @@
 # CONFIG_CMD_UBIFS is not set
 CONFIG_DOS_PARTITION=y
 CONFIG_ENV_IS_IN_SPI_FLASH=y
+CONFIG_BOOTCOUNT_LIMIT=y
 # CONFIG_MMC is not set
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_SPANSION=y