net: fman: remove reference to non-existing config PCS

Commit a7c2a32e ("net: fman: memac: Use lynx pcs driver") makes the
Freescale Data-Path Acceleration Architecture Frame Manager use lynx pcs
driver by selecting PCS_LYNX.

It also selects the non-existing config PCS as well, which has no effect.

Remove this select to a non-existing config.

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Link: https://lore.kernel.org/r/20221116102450.13928-1-lukas.bulwahn@gmail.com


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