net: ethernet: ti: am65-cpsw: enable p0 rx_vlan_remap

By default the tagged ingress packets to the switch from P0 got internal
switch priority assigned equal to the DMA CPPI channel number they came
from unless CPSW_P0_CONTROL_REG.RX_REMAP_VLAN. it causes issues with
applying QoS policies and mapping packets on external port fifos, because
the default configuration is vlan_aware and DMA CPPI channels are shared
between all external ports.

Hence enable CPSW_P0_CONTROL_REG.RX_REMAP_VLAN so packet will preserve
internal switch priority assigned following the VLAN(priority) tag no
matter through which DMA CPPI Channels packets enter the switch.

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>