google/panther: Disconnect speaker and mic in verb table

google/panther: Disconnect speaker and mic in verb table

There is no speaker and no builtin microphone in this system,
hence disable them in the verb table.

BRANCH=panther
BUG=chrome-os-partner:24230
TEST=Boot Panther, see Microphone and Speaker disappear
     in Audio Settings

Change-Id: I32bacec38ba3ba0c2359a8fc94e12af64f576012
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Signed-off-by: Stefan Reinauer <reinauer@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/182006
Reviewed-by: Dylan Reid <dgreid@chromium.org>
Commit-Queue: Stefan Reinauer <reinauer@chromium.org>
Tested-by: Stefan Reinauer <reinauer@chromium.org>
Reviewed-on: http://review.coreboot.org/6000
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>