net: stmmac: qcom-ethqos: change ethqos_configure*() to return void

net: stmmac: qcom-ethqos: change ethqos_configure*() to return void

The ethqos_configure*() family of functions always return zero, and the
return value is never checked. Change the int return type to void.

Reviewed-by: Mohd Ayaan Anwar <mohd.anwar@oss.qualcomm.com>
Tested-by: Mohd Ayaan Anwar <mohd.anwar@oss.qualcomm.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Link: https://patch.msgid.link/E1vuSKg-0000000ASbv-0iWL@rmk-PC.armlinux.org.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>