faft: Support SPACE key to trigger TO_NORM screen

We changed the key for triggering TO_NORM screen from ENTER to SPACE.
This change adds:
 - the logic of supporting the alternative of space (ctrl+f3) on servo;
 - custromized space command instead of using servo;
 - sending both SPACE and ENTER to trigger TO_NORM screen.

BUG=chrome-os-partner:12057
TEST=Run firmware_DevMode on Snow passed.

Change-Id: Ied9242c2484e0172e3cbe83ed7f6659a3afce0fe
Reviewed-on: https://gerrit.chromium.org/gerrit/28929
Reviewed-by: Vic Yang <victoryang@chromium.org>
Commit-Ready: Tom Wai-Hong Tam <waihong@chromium.org>
Tested-by: Tom Wai-Hong Tam <waihong@chromium.org>
2 files changed