Implement reset using PSHOLD and remove watchdog based reset not needed for ipx40xx. BUG=chrome-os-partner:49249 TEST=None. Initial code not sure if it will even compile BRANCH=none Change-Id: Ibd3f9958682ed2e85e778976df3a8e124a7441fd Signed-off-by: Patrick Georgi <pgeorgi@chromium.org> Original-Commit-Id: 65c8b9dd633f0d402cad7d609563c8aac9bf5115 Original-Change-Id: I8f0ea3c1b71e86a7ca733965ecbec6954a52f6e3 Original-Signed-off-by: Varadarajan Narayanan <varada@codeaurora.org> Original-Reviewed-on: https://chromium-review.googlesource.com/333298 Original-Commit-Ready: David Hendricks <dhendrix@chromium.org> Original-Reviewed-by: David Hendricks <dhendrix@chromium.org> Reviewed-on: https://review.coreboot.org/14663 Tested-by: build bot (Jenkins) Reviewed-by: Martin Roth <martinroth@google.com>