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This CL adds support to check if the OCM flash is erased and if not, will erase it at initialization time. These changes are encapsulated in a new config option CONFIG_USB_PD_TCPM_ANX7447_OCM_ERASE and this option is enabled for Yorp boards. BUG=b:77658388 BRANCH=NONE TEST=make -j buildall. Tested on a board that hadn't yet been erased. Verifed the message "anx7447: OCM flash checked and successfully erased" was in the EC log, but did not show up on subsequent reboots. Change-Id: I660e76a9498d3dc1ba821a04317b324f716c5089 Signed-off-by: Scott Collyer <scollyer@google.com> Reviewed-on: https://chromium-review.googlesource.com/988414 Commit-Ready: Jett Rink <jettrink@chromium.org> Tested-by: Jett Rink <jettrink@chromium.org> Reviewed-by: Daisuke Nojiri <dnojiri@chromium.org>