Disable Ethernet in U-Boot if ODROID-M1 (#3122)

It seems that the Ethernet initialization in U-Boot causes significant
packet drops in Linux on some board. On a ODROID-M1 with 8GB of RAM, a
packet loss rate of ~20% has been observed. From the user point of view
it feels like a massive slow down (SSH feels very slow, Home Assistant
loads very slow or not at all).

Disabling the Ethernet controller driver avoids initialization in U-Boot
and makes Ethernet work correctly again in Linux.

While at it, drop the previously board specific configs. They haven't
been used and the board seemed fine without them.

(cherry picked from commit bd3cae5)

buildroot-external/board/hardkernel/odroid-m1/uboot.config

@@ -1,5 +1,2 @@
-CONFIG_DOS_PARTITION=y
-# CONFIG_EFI_PARTITION is not set
-# CONFIG_USB_STORAGE is not set
-CONFIG_DISPLAY_BOARDINFO=y
-CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG=y
+# CONFIG_DWC_ETH_QOS is not set
+# CONFIG_DWC_ETH_QOS_ROCKCHIP is not set

buildroot-external/configs/odroid_m1_defconfig

@@ -137,7 +137,7 @@ BR2_TARGET_UBOOT_CUSTOM_GIT=y
 BR2_TARGET_UBOOT_CUSTOM_REPO_URL="https://github.com/u-boot/u-boot.git"
 BR2_TARGET_UBOOT_CUSTOM_REPO_VERSION="v2024.01"
 BR2_TARGET_UBOOT_BOARD_DEFCONFIG="odroid-m1-rk3568"
-BR2_TARGET_UBOOT_CONFIG_FRAGMENT_FILES="$(BR2_EXTERNAL_HASSOS_PATH)/bootloader/uboot.config"
+BR2_TARGET_UBOOT_CONFIG_FRAGMENT_FILES="$(BR2_EXTERNAL_HASSOS_PATH)/bootloader/uboot.config $(BR2_EXTERNAL_HASSOS_PATH)/board/hardkernel/odroid-m1/uboot.config"
 BR2_TARGET_UBOOT_NEEDS_PYLIBFDT=y
 BR2_TARGET_UBOOT_NEEDS_PYELFTOOLS=y
 BR2_TARGET_UBOOT_NEEDS_ATF_BL31=y