Drop the unused and broken function rtpcs_930x_sds_clock_wait from the
PCS driver. The proper working variant is already some lines above and
called rtpcs_930x_sds_wait_clock_ready.
Signed-off-by: Jonas Jelonek <jelonek.jonas@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/21146
Signed-off-by: Robert Marko <robimarko@gmail.com>