[][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-5.4/746-add-mediatek-2p5ge-phy-support.patch b/target/linux/mediatek/patches-5.4/746-add-mediatek-2p5ge-phy-support.patch
new file mode 100644
index 0000000..a102660
--- /dev/null
+++ b/target/linux/mediatek/patches-5.4/746-add-mediatek-2p5ge-phy-support.patch
@@ -0,0 +1,24 @@
+--- a/drivers/net/phy/Kconfig
++++ b/drivers/net/phy/Kconfig
+@@ -522,6 +522,11 @@ config MEDIATEK_GE_PHY
+ 	help
+ 	  Supports the MediaTek Gigabit Ethernet PHYs.
+ 
++config MEDIATEK_2P5GE_PHY
++	tristate "MediaTek 2.5Gb Ethernet PHYs"
++	---help---
++	  Supports MediaTek internal 2.5Gb Ethernet PHYs.
++
+ config MICREL_PHY
+ 	tristate "Micrel PHYs"
+ 	---help---
+--- a/drivers/net/phy/Makefile
++++ b/drivers/net/phy/Makefile
+@@ -95,6 +95,7 @@ obj-$(CONFIG_LXT_PHY)		+= lxt.o
+ obj-$(CONFIG_MARVELL_PHY)	+= marvell.o
+ obj-$(CONFIG_MARVELL_10G_PHY)	+= marvell10g.o
+ obj-$(CONFIG_MEDIATEK_GE_PHY)	+= mediatek-ge.o
++obj-$(CONFIG_MEDIATEK_2P5GE_PHY)+= mediatek-2p5ge.o
+ obj-$(CONFIG_MESON_GXL_PHY)	+= meson-gxl.o
+ obj-$(CONFIG_MICREL_KS8995MA)	+= spi_ks8995.o
+ obj-$(CONFIG_MICREL_PHY)	+= micrel.o