[][openwrt][mt7988][integration][Add basic Filogic 880 SoC support]

[Description]
Add basic filogic 880 SoC support to openwrt 21.02

[Release-log]

Change-Id: I57791df2e9f9f4729cb2d32f734090de52c370f2
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6592143
Build: srv_hbgsm110
diff --git a/target/linux/mediatek/patches-5.4/0001-cpufreq-add-the-missing-platform-driver-unregister.patch b/target/linux/mediatek/patches-5.4/0001-cpufreq-add-the-missing-platform-driver-unregister.patch
new file mode 100644
index 0000000..fdf953d
--- /dev/null
+++ b/target/linux/mediatek/patches-5.4/0001-cpufreq-add-the-missing-platform-driver-unregister.patch
@@ -0,0 +1,12 @@
+diff --git a/drivers/cpufreq/mediatek-cpufreq.c b/drivers/cpufreq/mediatek-cpufreq.c
+index 927ebc5..03bb7b5 100644
+--- a/drivers/cpufreq/mediatek-cpufreq.c
++++ b/drivers/cpufreq/mediatek-cpufreq.c
+@@ -573,6 +573,7 @@ static int __init mtk_cpufreq_driver_init(void)
+ 	pdev = platform_device_register_simple("mtk-cpufreq", -1, NULL, 0);
+ 	if (IS_ERR(pdev)) {
+ 		pr_err("failed to register mtk-cpufreq platform device\n");
++		platform_driver_unregister(&mtk_cpufreq_platdrv);
+ 		return PTR_ERR(pdev);
+ 	}
+