Fix gyro orientation offset for EONs with OP3T mainboards (#1738)

* One-time zap of OP3T sensor registry

* Bash, I wish I knew how to quit you

* Better comment wording

* Slight increase for sensor reset settle-time

Co-authored-by: Comma Device <device@comma.ai>
old-commit-hash: c2c00f65a7

launch_chffrplus.sh

@@ -99,6 +99,18 @@ function launch {
     fi
   fi
 
+  # One-time fix for a subset of OP3T with gyro orientation offsets.
+  # Remove and regenerate qcom sensor registry. Only done on OP3T mainboards.
+  # Performed exactly once. The old registry is preserved just-in-case, and
+  # doubles as a flag denoting we've already done the reset.
+  # TODO: we should really grow per-platform detect and setup routines
+  if ! $(grep -q "letv" /proc/cmdline) && [ ! -f "/persist/comma/op3t-sns-reg-backup" ]; then
+    echo "Performing OP3T sensor registry reset"
+    mv /persist/sensors/sns.reg /persist/comma/op3t-sns-reg-backup &&
+      rm -f /persist/sensors/sensors_settings /persist/sensors/error_log /persist/sensors/gyro_sensitity_cal &&
+      echo "restart" > /sys/kernel/debug/msm_subsys/slpi &&
+      sleep 5  # Give Android sensor subsystem a moment to recover
+  fi
 
   # handle pythonpath
   ln -sfn $(pwd) /data/pythonpath