Merge branch 'r8169-add-and-use-helper-rtl_is_8168evl_up'

Heiner Kallweit says:

====================
r8169: add and use helper rtl_is_8168evl_up

Few registers have been added or changed its purpose with version
RTL8168e-vl, so create a helper for identifying chip versions from
RTL8168e-vl.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>