mediatek: update uci-defaults for renamed smp packet steering option

Leave as enabled by default for mediatek. Also remove obsolete
settings from when packet steering was moved from netifd to a
simplified hotplug script.

Signed-off-by: Alan Swanson <[email protected]>

target/linux/mediatek/base-files/etc/uci-defaults/99-net-ps

@@ -1,7 +1,4 @@
-uci set network.globals.default_rps_val=14
-uci set network.globals.default_rps_flow_cnt=256
-uci set network.globals.default_xps_val=14
-uci set network.globals.default_ps=1
+uci set network.globals.packet_steering=1
 uci set network.eth0=device
 uci set network.eth0.name=eth0
 uci set network.lan0=device