Convert CONFIG_MX_CYCLIC to Kconfig

This converts the following to Kconfig:
   CONFIG_MX_CYCLIC

Signed-off-by: Adam Ford <aford173@gmail.com>
Acked-by: David Lechner <david@lechnology.com>
diff --git a/configs/da850evm_defconfig b/configs/da850evm_defconfig
index 7cbc9fb..3a1a60c 100644
--- a/configs/da850evm_defconfig
+++ b/configs/da850evm_defconfig
@@ -27,6 +27,7 @@
 CONFIG_HUSH_PARSER=y
 CONFIG_SYS_PROMPT="U-Boot > "
 CONFIG_CRC32_VERIFY=y
+CONFIG_MX_CYCLIC=y
 CONFIG_CMD_DM=y
 # CONFIG_CMD_FLASH is not set
 # CONFIG_CMD_GPT is not set