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Use the PDCMD task to handle PD MCU interrupts, and use it to trigger the tcpc_alert(). Note this fixes bug on Glados and Oak that could cause watchdog reset because tcpc_alert() which uses i2c to talk to tcpc was called from hooks task and can delay tickling watchdog. BUG=chrome-os-partner:40920 BRANCH=none TEST=load on glados and plug zinger into both ports many times. make sure we get a stable contract and no watchdog reset. Change-Id: I37625fae2ca0057d2ee8fa1eea6974f2d26d1b91 Signed-off-by: Alec Berg <alecaberg@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/275296 Reviewed-by: Scott Collyer <scollyer@chromium.org> Reviewed-by: Shawn N <shawnn@chromium.org>