net: sparx5: configure TAS port link speed

On the TSN and RED variants of LAN969x and SparX-5i TAS (Time-Aware Shaper)
is present in the silicon.

Currently, the driver does not use configure it at all, which means that
the TAS_PROFILE_CONFIG.LINK_SPEED[1] value is left at the default of 3
which means that its configured for 1 Gbps.

So, running iperf between two 10G switch ports will result in only 940-ish
Mbps while we should be getting around 9.3 Gbps.

Correctly populating the TAS_PROFILE_CONFIG.LINK_SPEED[1] with the current
port speed fixes this issue and we achieve around 9.4 Gbps between two 10G
switch ports.

So, port the TAS port link speed setting from the vendor BSP 6.18 kernel[2]

[1] https://microchip-ung.github.io/lan969x-industrial_reginfo/reginfo_LAN969x-Industrial.html?select=hsch,tas_profile_cfg,tas_profile_config,link_speed
[2] https://github.com/microchip-ung/linux/tree/bsp-6.18-2026

Signed-off-by: Robert Marko <robert.marko@sartura.hr>
Link: https://patch.msgid.link/20260707170531.1129866-1-robert.marko@sartura.hr
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

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