Convert CONFIG_SYS_FSL_SEC_MON et al to Kconfig

This converts the following to Kconfig:
   CONFIG_SYS_FSL_SEC_MON
   CONFIG_SYS_FSL_SEC_MON_BE
   CONFIG_SYS_FSL_SEC_MON_LE

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/ls1012afrwy_qspi_SECURE_BOOT_defconfig b/configs/ls1012afrwy_qspi_SECURE_BOOT_defconfig
index 7c69d56..5121819 100644
--- a/configs/ls1012afrwy_qspi_SECURE_BOOT_defconfig
+++ b/configs/ls1012afrwy_qspi_SECURE_BOOT_defconfig
@@ -47,6 +47,7 @@
 CONFIG_MPC8XXX_GPIO=y
 CONFIG_DM_I2C=y
 CONFIG_I2C_SET_DEFAULT_BUS_NUM=y
+CONFIG_SYS_FSL_SEC_MON_BE=y
 CONFIG_FSL_ESDHC=y
 CONFIG_MTD=y
 CONFIG_DM_SPI_FLASH=y