Convert CONFIG_CMD_SATA to Kconfig

This converts the following to Kconfig:
   CONFIG_CMD_SATA

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/configs/wandboard_defconfig b/configs/wandboard_defconfig
index b4b3283..95a14ca 100644
--- a/configs/wandboard_defconfig
+++ b/configs/wandboard_defconfig
@@ -25,6 +25,7 @@
 CONFIG_CMD_I2C=y
 CONFIG_CMD_USB=y
 CONFIG_CMD_GPIO=y
+CONFIG_CMD_SATA=y
 CONFIG_CMD_CACHE=y
 CONFIG_CMD_EXT4_WRITE=y
 CONFIG_DM=y