poppy: use return key for selection
poppy: use return key for selection

Replacing right arrow key with return for selection
when keyboard is available because it's more obvious.

BUG=b:35585623
BRANCH=None
TEST=reboot and make sure return selects menu item.

Change-Id: I6b2fbd8cddcd98c49638a6b9d79b47da1ca6545f
Signed-off-by: Shelley Chen <ab7b8cc85923339aed379eb1c5cc4dccfd2eb3d7@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/444944
Reviewed-by: Randall Spangler <62698fdbb84d1779579ee80c3f39fac22017e5bc@chromium.org>

coreboot/vboot,coreboot/vboot,coreboot/vboot,coreboot/vboot,coreboot/vboot