Include "config.h" in include/watchdog.h.
Include "config.h" in include/watchdog.h.

Without this include, the `watchdog_reload()` function will be compiled
as a noop unless "config.h" is included before "watchdog.h" in whatever
compilation unit requires watchdog functionality.

BUG=none
BRANCH=none
TEST=make buildall -j

Change-Id: I311019753f6d61890be1e475664bd528e5250729
Reviewed-on: https://chromium-review.googlesource.com/449694
Commit-Ready: Jeff Andersen <77e9dfce80ee5775241df045b40f54f5881f8209@google.com>
Tested-by: Jeff Andersen <77e9dfce80ee5775241df045b40f54f5881f8209@google.com>
Reviewed-by: Vadim Bendebury <5515d6d2d0829cbe0dd0dcf2094aaded06d58514@chromium.org>
Reviewed-by: Vincent Palatin <70a9964ec8fd10b0b08fcc8623c2add25ddf99ac@chromium.org>

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