dm: sandbox: Enable SATA

Enable building the SATA code for sandbox. This increases build coverage
for sandbox.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/configs/sandbox.h b/include/configs/sandbox.h
index affc9cc..7127611 100644
--- a/include/configs/sandbox.h
+++ b/include/configs/sandbox.h
@@ -208,4 +208,7 @@
 #define CONFIG_SYS_SCSI_MAX_SCSI_ID	8
 #define CONFIG_SYS_SCSI_MAX_LUN		4
 
+#define CONFIG_CMD_SATA
+#define CONFIG_SYS_SATA_MAX_DEVICE	2
+
 #endif