net: mvpp2: handle misc PPv2.1/PPv2.2 differences

net: mvpp2: handle misc PPv2.1/PPv2.2 differences

This commit handles a few miscellaneous differences between PPv2.1 and
PPv2.2 in different areas, where code done for PPv2.1 doesn't apply for
PPv2.2 or needs to be adjusted (getting the MAC address, disabling PHY
polling, etc.).

Changed by Stefan for U-Boot:
Since mvpp2_port_power_up() has multiple callers in U-Boot, the U-Boot
version of this patch does not remove this function but simply adds the
check for MVPP21 before the mvpp2_port_fc_adv_enable() call.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Stefan Roese <sr@denx.de>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>