can: update can-bcm for hrtimer hardirq callbacks

can: update can-bcm for hrtimer hardirq callbacks

Since commit b3b62f0ffaeaa4b6ee6c9a45834a36848c5665d3 ("hrtimer:
removing all ur callback modes") the hrtimer callbacks are processed
only in hardirq context.

This patch moves some functionality into tasklets to run in softirq
context.

Additionally some duplicated code was removed in bcm_rx_thr_flush()
and an avoidable memcpy was removed from bcm_rx_handler().

Signed-off-by: Oliver Hartkopp <oliver@hartkopp.net>
Signed-off-by: David S. Miller <davem@davemloft.net>