The clock-ready debug readback is used by the SDK's 10G SerDes setup
sequence. Restrict polling to 10G-type SerDes while retaining the
existing exclusion for OFF mode.
This avoids applying the check to the 5G QSGMII SerDes 0 and 1, which can
report clock synchronization failures despite working links.
Assisted-By: ChatGPT (OpenAI GPT-6.1 Sol)
Link: https://github.com/openwrt/openwrt/pull/25882
Signed-off-by: Jonas Jelonek <jonas@jonasjelonek.de>
Jonas Jelonek
27d97aa507