r8169: remove support for chip version 11

This is a follow-up to 982300c1 ("r8169: remove detection of chip
version 11 (early RTL8168b)"). Nobody complained yet, so remove
support for this chip version.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/b689ab6d-20b5-4b64-bd7e-531a0a972ba3@gmail.com


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