oxnas: move service file to correct place

This service file has been misplaced from the very beginning.

Fixes: dcc34574ef ("oxnas: bring in new oxnas target")
Signed-off-by: Sungbo Eo <mans0n@gorani.run>

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

@@ -0,0 +1,22 @@
+#!/bin/sh /etc/rc.common
+
+START=99
+
+get_irq() {
+	local name="$1"
+	grep -m 1 "$name" /proc/interrupts | cut -d: -f1 | sed 's, *,,'
+}
+
+set_irq_affinity() {
+	local name="$1"
+	local val="$2"
+	local irq="$(get_irq "$name")"
+	[ -n "$irq" ] || return
+	echo "$val" > "/proc/irq/$irq/smp_affinity"
+}
+
+start() {
+	set_irq_affinity ehci_hcd 2
+	set_irq_affinity xhci_hcd 2
+	set_irq_affinity sata 2
+}