amt: enable watchdog sysfs

LMS service of AMT requires that watchdog sysfs be enabled.

Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>

features/mei/amt.cfg

 # SPDX-License-Identifier: MIT
 CONFIG_WATCHDOG_CORE=y
+CONFIG_WATCHDOG_SYSFS=y
 CONFIG_INTEL_MEI_WDT=m