stm32: Add watchdog debug message for hwtimer32
stm32: Add watchdog debug message for hwtimer32

This adds the option to use one 16-bit timer for watchdog helper when
using 32-bit hwtimer. With this, a debug message is dumped before
watchdog fires and we can easily see the task hogging the processor.

BRANCH=None
BUG=None
TEST=On Ryu P2, 'waitms 3000' and see debug message before the EC
reboots.

Signed-off-by: Vic Yang <victoryang@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/225253
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
(cherry picked from commit c72c86b9b18d0ca609ede492f910bc2fc98b468c)
Signed-off-by: Duncan Laurie <70662b43bc1a20b57ded72a2b08be88dd0da4841@chromium.org>

Change-Id: I498f63a105a0ba1ab7ec7d274dc8b1f16a44140f
Reviewed-on: https://chromium-review.googlesource.com/225753
Tested-by: Duncan Laurie <70662b43bc1a20b57ded72a2b08be88dd0da4841@chromium.org>
Reviewed-by: Duncan Laurie <70662b43bc1a20b57ded72a2b08be88dd0da4841@chromium.org>
Commit-Queue: Duncan Laurie <70662b43bc1a20b57ded72a2b08be88dd0da4841@chromium.org>

thehobn/ec,thehobn/ec,thehobn/ec,thehobn/ec