PCIe island clock frequency is used when converting coalescing
parameters from usecs to NFP timestamps.  Most chips don't run
at 1200MHz, allow FW to provide us with the real frequency.
Signed-off-by: NJakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: NDirk van der Merwe <dirk.vandermerwe@netronome.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>