[PATCH v3 4/8] sandbox: dtsi: add buttons

[Simon Glass]

Adds two buttons on sandbox so button framework may be tested.

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

 arch/sandbox/dts/sandbox.dtsi | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

Applied to u-boot-dm, thanks!