docs/CARS: Add 2021 C-HR (#23078)
docs/CARS: Add 2021 C-HR (#23078)

`@eFini#8426` confirmed...
https://discord.com/channels/469524606043160576/524327905937850394/914925655228031017 [my inquiry]
https://discord.com/channels/469524606043160576/524327905937850394/915131655679791144 [his confirmation]

Still stuck w/ stock longitudinal, despite being TSS2.5.

He's been using it for many months, as seen in one of his early posts that came to Adeeb's attention for route analysis...
https://discord.com/channels/469524606043160576/524327905937850394/827038344742699008 [`88551059c417a545|2021-03-29--23-34-50`]
commaai/openpilot,commaai/openpilot,commaai/openpilot,commaai/openpilot,commaai/openpilot,commaai/openpilot