RDMA/hfi1: Remove unused one_qsfp_write

The last use of one_qsfp_write() was removed in 2016's
commit 145dd2b3 ("IB/hfi1: Always turn on CDRs for low power QSFP
modules")

Remove it.

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Link: https://patch.msgid.link/20250223215543.153312-1-linux@treblig.org


Signed-off-by: Leon Romanovsky <leon@kernel.org>