hatch/kohaku: Account for TCPC reset polarity in ALERT handler

Reset polarity was added to tcpc_config so that the reset function
could be common across different boards which have different TCPC
selections. This was applied to pd_reset_mcu(), however, that CL did
not take into account the reset polarity in the tcpc_get_alert_status
function. This CL fixes that oversight.

In addition, this CL fixes the name for kohaku's port 0 TCPC reset
line to match the schematic.

BUG=b:130194031
BRANCH=none
TEST=verified on Hatch that both ports 0/1 function correctly.

Change-Id: I0d75d3655c799d4c74f4a6fb1805c06c1fe99c06
Signed-off-by: Scott Collyer <scollyer@google.com>
Reviewed-on: https://chromium-review.googlesource.com/1582964
Commit-Ready: Scott Collyer <scollyer@chromium.org>
Tested-by: Scott Collyer <scollyer@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@chromium.org>