net: prestera: use phylink_pcs_change() to report PCS link change events

Use phylink_pcs_change() when reporting changes in PCS link state to
phylink as the interrupts are informing us about changes to the PCS
state.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/r/E1s0OGx-009hgr-NP@rmk-PC.armlinux.org.uk


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