mediatek/mt8183: Add watchdog timer support

Using common watchdog timer (WDT) code for reset. Set up watchdog timer
in mtk_wdt_init() to get reset status and disable auto-reboot. Link
common do_hard_reset() to support hard reset.

BUG=b:80501386
BRANCH=none
TEST=both mtk_wdt_init() and do_hard_reset() work on Kukui.

Change-Id: I4be3a133dbb8a64604133cefb0c5f02d01afd0d4
Signed-off-by: Tristan Shieh <tristan.shieh@mediatek.com>
Reviewed-on: https://review.coreboot.org/27026
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
3 files changed