net: renesas: rswitch: remove speed from gwca structure

This field is set but never used.

GWCA is rswitch CPU interface module which connects rswitch to the
host over AXI bus. Speed of the switch ports is not anyhow related to
GWCA operation.

Signed-off-by: Nikita Yushchenko <nikita.yoush@cogentembedded.com>
Reviewed-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com>
Link: https://patch.msgid.link/20241206192140.1714-2-nikita.yoush@cogentembedded.com


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