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/sandbox_noblk_defconfig b/configs/sandbox_noblk_defconfig
index 4bf1f4b..519e91f 100644
--- a/configs/sandbox_noblk_defconfig
+++ b/configs/sandbox_noblk_defconfig
@@ -30,6 +30,7 @@
 CONFIG_CMD_MX_CYCLIC=y
 CONFIG_CMD_MEMINFO=y
 CONFIG_CMD_DEMO=y
+CONFIG_CMD_IDE=y
 CONFIG_CMD_GPT=y
 CONFIG_CMD_PART=y
 CONFIG_CMD_SF=y