hw timestamp missing

[AleksandarFilipov]

Describe the bug
No hw timestamp provided when doing candump -x -ta -H can0
Time 0 is always returned

To Reproduce
Steps to reproduce the behavior:

wire can1 and can0 by physically connecting wires to can_h and can_l
in one terminal do:
candump -x -ta -H can0
in anoter terminal do:
cansend can1 123#123123

Expected behavior
some increasing time is expected as output

Removing -H does report kernel time as expected (1617269100.654171) can0 RX - - 123 [3] 12 31 23, but to get better precision -H is desired. And considering that the latest hat has a rtc onboard.

Summary
Thanks for providing and supporting a great can shield!