ipq807x: improve detect ethernet device

Signed-off-by: Tianling Shen <cnsztl@immortalwrt.org>
(cherry picked from commit a90939c563)

target/linux/ipq807x/base-files/etc/init.d/set-irq-affinity

@@ -3,13 +3,12 @@
 START=99
 
 start() {
-	for eth in /sys/class/net/*; do
-		[ -e "$eth/device" ] || continue
+	for eth in /sys/class/net/lan* /sys/class/net/wan /sys/class/net/10g-*; do
+		[ -d "$eth" ] || continue
 		for i in "$eth"/queues/rx-*/rps_cpus; do echo "f" > "$i"; done
 		for i in "$eth"/queues/rx-*/rps_flow_cnt; do echo "4096" > "$i"; done
 		for i in "$eth"/queues/tx-*/xps_cpus; do echo "f" > "$i"; done
 	done
 
 	echo "32768" > "/proc/sys/net/core/rps_sock_flow_entries"
-	echo "1" > "/proc/sys/net/core/backlog_threaded"
 }