Convert CONFIG_SYS_BOOTCOUNT_LE et al to Kconfig

This converts the following to Kconfig:
   CONFIG_SYS_BOOTCOUNT_LE
   CONFIG_SYS_BOOTCOUNT_BE

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/dh_imx6_defconfig b/configs/dh_imx6_defconfig
index 7cb4f41..051816f 100644
--- a/configs/dh_imx6_defconfig
+++ b/configs/dh_imx6_defconfig
@@ -69,6 +69,7 @@
 CONFIG_DWC_AHSATA=y
 CONFIG_LBA48=y
 CONFIG_BOOTCOUNT_LIMIT=y
+CONFIG_SYS_BOOTCOUNT_BE=y
 CONFIG_SYS_DFU_DATA_BUF_SIZE=0x1000000
 CONFIG_DM_I2C=y
 CONFIG_SYS_I2C_MXC=y