misc: mei: set WDIOF_ALARMONLY on mei watchdog

mei watchdog doesn't reboot the system it only produces event
therefore mark it as WDIOF_ALARMONLY.

This patch depends on:
commit 2bbeed01
Author: Alan Cox <alan@linux.intel.com>
watchdog: Add a flag to indicate the watchdog doesn't reboot things

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>