[PATCH v3 6/8] sandbox: enable button

[Simon Glass]

Enable the support of button (driver and command) on sandbox.

Reviewed-by: Simon Glass <sjg at chromium.org>
Signed-off-by: Philippe Reynes <philippe.reynes at softathome.com>
---
Changelog:
v3:
- no change
v2:
- no change

 configs/sandbox_defconfig | 2 ++
 1 file changed, 2 insertions(+)

Applied to u-boot-dm, thanks!