ath79: add seama header fixup for Qihoo C301

This script is copied from ar71xx. Without a header fixup, u-boot
checksum for kernel will fail after the first boot.

Fixes: a9360452f0 ("ath79: add support for Qihoo C301")

Signed-off-by: Chuanhong Guo <gch981213@gmail.com>

target/linux/ath79/base-files/etc/uci-defaults/09_fix-checksum

@@ -0,0 +1,15 @@
+#!/bin/sh
+. /lib/functions.sh
+
+fix_seama_header() {
+	local kernel_size=$(sed -n 's/mtd[0-9]*: \([0-9a-f]*\).*"kernel".*/\1/p' /proc/mtd)
+	[ "$kernel_size" ] && mtd -c 0x$kernel_size fixseama firmware
+}
+
+board=$(board_name)
+
+case "$board" in
+qihoo,c301)
+	fix_seama_header
+	;;
+esac