Convert CONFIG_CMD_IDE to Kconfig

This converts the following to Kconfig:
   CONFIG_CMD_IDE

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/M5253DEMO_defconfig b/configs/M5253DEMO_defconfig
index 789dddb..09640de 100644
--- a/configs/M5253DEMO_defconfig
+++ b/configs/M5253DEMO_defconfig
@@ -3,6 +3,7 @@
 CONFIG_TARGET_M5253DEMO=y
 CONFIG_BOOTDELAY=5
 # CONFIG_DISPLAY_BOARDINFO is not set
+CONFIG_CMD_IDE=y
 # CONFIG_CMD_SETEXPR is not set
 CONFIG_CMD_PING=y
 CONFIG_CMD_CACHE=y