net: dsa: qca: remove qca8k_get_mac_eee()

qca8k_get_mac_eee() is no longer called by the core DSA code. Remove it.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Link: https://patch.msgid.link/E1tUllP-007UzF-Gk@rmk-PC.armlinux.org.uk


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