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/M54455EVB_defconfig b/configs/M54455EVB_defconfig
index 6f624e6..e57323d 100644
--- a/configs/M54455EVB_defconfig
+++ b/configs/M54455EVB_defconfig
@@ -4,6 +4,7 @@
 CONFIG_SYS_EXTRA_OPTIONS="SYS_ATMEL_BOOT,SYS_INPUT_CLKSRC=33333333"
 CONFIG_BOOTDELAY=1
 CONFIG_SYS_PROMPT="-> "
+CONFIG_CMD_IDE=y
 # CONFIG_CMD_LOADB is not set
 # CONFIG_CMD_LOADS is not set
 CONFIG_CMD_SF=y