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/inka4x0_defconfig b/configs/inka4x0_defconfig
index 9b30244..c263cf6 100644
--- a/configs/inka4x0_defconfig
+++ b/configs/inka4x0_defconfig
@@ -3,6 +3,7 @@
 CONFIG_TARGET_INKA4X0=y
 CONFIG_BOOTDELAY=1
 CONFIG_LOOPW=y
+CONFIG_CMD_IDE=y
 CONFIG_CMD_USB=y
 # CONFIG_CMD_SETEXPR is not set
 CONFIG_CMD_DHCP=y