net: mscc: ocelot: Remove unused declarations

Commit 6c30384e ("net: mscc: ocelot: register devlink ports")
declared but never implemented ocelot_devlink_init() and
ocelot_devlink_teardown().
Commit 20968054 ("net: mscc: ocelot: automatically detect VCAP constants")
declared but never implemented ocelot_detect_vcap_constants().
Commit 403ffc2c ("net: mscc: ocelot: add support for preemptible traffic classes")
declared but never implemented ocelot_port_update_preemptible_tcs().

Signed-off-by: Yue Haibing <yuehaibing@huawei.com>
Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Link: https://lore.kernel.org/r/20230821130218.19096-1-yuehaibing@huawei.com


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