sim: fix gps message (#25521)
sim: fix gps message (#25521)

fix gps timestamp field renamed

bug introduced in https://github.com/commaai/cereal/pull/341
commaai/openpilot,commaai/openpilot,commaai/openpilot,commaai/openpilot,commaai/openpilot,commaai/openpilot