uboot-mediatek: add patches for MT7988 and builds for RFB

Import pending patches adding support for MT7988 and provide builds
for the reference board for all possible boot media.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

package/boot/uboot-mediatek/patches/101-19-net-mediatek-add-missing-static-qualifier.patch

@@ -0,0 +1,36 @@
+From 9d35558bedfb82860c63cc11d3426afcbd82cb5c Mon Sep 17 00:00:00 2001
+From: Weijie Gao <weijie.gao@mediatek.com>
+Date: Wed, 19 Jul 2023 17:17:07 +0800
+Subject: [PATCH 19/29] net: mediatek: add missing static qualifier
+
+mt7531_mmd_ind_read and mt753x_switch_init are defined without static.
+Since they're not used outside this file, we should add them back.
+
+Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
+
+fixup to add static qualifier
+---
+ drivers/net/mtk_eth.c | 5 +++--
+ 1 file changed, 3 insertions(+), 2 deletions(-)
+
+--- a/drivers/net/mtk_eth.c
++++ b/drivers/net/mtk_eth.c
+@@ -436,7 +436,8 @@ static int mt7531_mii_ind_write(struct m
+ 			     MDIO_ST_C22);
+ }
+ 
+-int mt7531_mmd_ind_read(struct mtk_eth_priv *priv, u8 addr, u8 devad, u16 reg)
++static int mt7531_mmd_ind_read(struct mtk_eth_priv *priv, u8 addr, u8 devad,
++			       u16 reg)
+ {
+ 	u8 phy_addr;
+ 	int ret;
+@@ -934,7 +935,7 @@ static int mt7531_setup(struct mtk_eth_p
+ 	return 0;
+ }
+ 
+-int mt753x_switch_init(struct mtk_eth_priv *priv)
++static int mt753x_switch_init(struct mtk_eth_priv *priv)
+ {
+ 	int ret;
+ 	int i;