slippy/flaco/peppy: setup beep verbs

Add verb setting for beep during recovery and dev mode.
Requires depthcharge CL.

Change-Id: I13cbb4e889ebc4c27bb4ab9fa49601b03e872d09
Signed-off-by: Marc Jones <marc.jones@se-eng.com>
Reviewed-on: https://gerrit.chromium.org/gerrit/66519
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-by: Dylan Reid <dgreid@chromium.org>
Commit-Queue: Duncan Laurie <dlaurie@chromium.org>
(cherry picked from commit c072543946b317192a8e80a744c1515deb414456)
Signed-off-by: Isaac Christensen <isaac.christensen@se-eng.com>
Reviewed-on: http://review.coreboot.org/6502
Tested-by: build bot (Jenkins)
Reviewed-by: David Hendricks <dhendrix@chromium.org>
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>