mchp: Update chip watchdog timer for MEC172x
mchp: Update chip watchdog timer for MEC172x

MEC172x uses the same watchdog timer hardware as MEC152x. Update
the macro logic to build same code for both MEC152x and MEC172x.
Fix bug in debug configuration: modify control register instead
of overwriting.

BRANCH=none
BUG=none
TEST=Build MCHP MEC170x and MEC152x boards

Signed-off-by: Scott Worley <186210b307f58d6c0a191337b635ed93ad075837@microchip.corp-partner.google.com>
Change-Id: I407fa0b4ed0acc33e4d86a980749b64cd7465ac8
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2748795
Reviewed-by: Martin Yan <409cb29bb9001f9bb84010e71644764e5f7609ce@microchip.corp-partner.google.com>
Reviewed-by: Aseda Aboagye <12c9b286316a940fd31c24070da5ab64cdd4d0e7@chromium.org>
Reviewed-by: Ravin Kumar <a0e97d6aca75c950342a3a8ebb8bd1c89d88be3e@microchip.com>
Tested-by: Martin Yan <409cb29bb9001f9bb84010e71644764e5f7609ce@microchip.corp-partner.google.com>
Commit-Queue: Aseda Aboagye <12c9b286316a940fd31c24070da5ab64cdd4d0e7@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec