atm: fore200e: Drop unnecessary of_match_device()

It is not necessary to call of_match_device() in probe. If we made it to
probe, then we've already successfully matched.

Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/r/20231006214421.339445-1-robh@kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>