r8169: set tc_offset only if tally counter reset isn't supported

On chip versions supporting tally counter reset we currently update
the counters after a reset although we know all counters are zero.
Skip this unnecessary step.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Link: https://lore.kernel.org/r/526618b2-b1bf-1844-b82a-dab2df7bdc8f@gmail.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>