bootstd: Add an IDE bootdev

Add a bootdev for IDE so that these devices can be used with standard
boot.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/sandbox_flattree_defconfig b/configs/sandbox_flattree_defconfig
index 1563a51..cc1b3ac 100644
--- a/configs/sandbox_flattree_defconfig
+++ b/configs/sandbox_flattree_defconfig
@@ -40,6 +40,7 @@
 CONFIG_CMD_DEMO=y
 CONFIG_CMD_GPIO=y
 CONFIG_CMD_GPT=y
+CONFIG_CMD_IDE=y
 CONFIG_CMD_I2C=y
 CONFIG_CMD_MMC=y
 CONFIG_CMD_OSD=y
@@ -90,6 +91,13 @@
 CONFIG_ADC_SANDBOX=y
 CONFIG_AXI=y
 CONFIG_AXI_SANDBOX=y
+CONFIG_SYS_IDE_MAXBUS=1
+CONFIG_SYS_ATA_BASE_ADDR=0x100
+CONFIG_SYS_ATA_STRIDE=4
+CONFIG_SYS_ATA_DATA_OFFSET=0
+CONFIG_SYS_ATA_REG_OFFSET=1
+CONFIG_SYS_ATA_ALT_OFFSET=2
+CONFIG_SYS_ATA_IDE0_OFFSET=0
 CONFIG_CLK=y
 CONFIG_CLK_COMPOSITE_CCF=y
 CONFIG_CLK_K210=y