dm: sandbox: pci: Enable PCI for sandbox

Enable PCI options so that sandbox can be used for testing this bus with
driver model.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/configs/sandbox.h b/include/configs/sandbox.h
index febbfb6..c12c538 100644
--- a/include/configs/sandbox.h
+++ b/include/configs/sandbox.h
@@ -34,6 +34,10 @@
 #define CONFIG_CMD_FDT
 #define CONFIG_ANDROID_BOOT_IMAGE
 
+#define CONFIG_CMD_PCI
+#define CONFIG_PCI_PNP
+#define CONFIG_CMD_IO
+
 #define CONFIG_FS_FAT
 #define CONFIG_FAT_WRITE
 #define CONFIG_FS_EXT4