GM camera ACC: get VIN from camera

[sshane]

Can potentially use this to fingerprint camera-ACC GMs. Note that we still rely on OBD port for ASCM-based cars to get the VIN, but can potentially get it from another ECU in the future

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>>> get_vin(None, None, retry=1, buses=(0, 1))
# print(request, response, bus, vin_addrs, functional_addrs, rx_offset)
b'"\xf1\x90' b'b\xf1\x90' 0 [2016, 2018, 416944369, 416943857] [2015, 417018865] 8
b'\t\x02' b'I\x02\x01' 0 [2016, 2018, 416944369, 416943857] [2015, 417018865] 8
b'\x1a\x90' b'Z\x90' 0 [587] None 1024
b'"\xf1\x90' b'b\xf1\x90' 1 [2016, 2018, 416944369, 416943857] [2015, 417018865] 8
b'\t\x02' b'I\x02\x01' 1 [2016, 2018, 416944369, 416943857] [2015, 417018865] 8

[sshane]

FW query time drops from 2.1s to 1.5s with #31221!