Convert CONFIG_BOOTCOUNT_I2C to Kconfig

This converts the following to Kconfig:
  CONFIG_BOOTCOUNT_I2C

Signed-off-by: Alex Kiernan <alex.kiernan@gmail.com>
Reviewed-by: Lukasz Majewski <lukma@denx.de>
diff --git a/configs/ids8313_defconfig b/configs/ids8313_defconfig
index 5557402..5ca7703 100644
--- a/configs/ids8313_defconfig
+++ b/configs/ids8313_defconfig
@@ -35,6 +35,7 @@
 CONFIG_BOOTP_HOSTNAME=y
 CONFIG_BOOTP_SUBNETMASK=y
 CONFIG_BOOTCOUNT_LIMIT=y
+CONFIG_BOOTCOUNT_I2C=y
 # CONFIG_MMC is not set
 CONFIG_MTD_NOR_FLASH=y
 CONFIG_PHYLIB=y