MT7668 Wi-Fi not working and Power/Recovery button has no effect on ZTE B860H (S905X)

[Damir00109]

### Problem description

On ZTE B860H (Amlogic S905X, 2GB RAM) with Armbian image `Armbian_26.05.0_amlogic_s905x-b860h_resolute_6.18.26_server_2026.05.02`, two things do not work:

1. **Built-in Wi-Fi (MT7668)** – interface `wlan0` does not appear. The system boots fine, Ethernet and USB work, but Wi-Fi is absent.
2. **Power button** (which also acts as Recovery/Boot button) – no reaction at all. Pressing it does nothing (no shutdown, no reboot, no enter recovery).

Everything else works correctly (boot from SD card, Ethernet, USB, HDMI).

### What I tried for Wi-Fi

- Different DTB files (`meson-gxl-s905x-b860h.dtb`, `p212.dtb`, `khadas-vim.dtb`) – no change.
- Installing `armbian-firmware-full`, `firmware-misc-nonfree` – didn't help.
- `dmesg` shows an unknown SDIO device (likely MT7668) but no driver loads.
- Manual compilation of MT7668 drivers (CoreELEC, noob404yt) fails on kernel 6.18.26 with error `-fmin-function-alignment=4`.

### What I tried for Power button

- Checked GPIO mappings, but the button seems not bound to any action in Armbian.
- No ACPI or input event generated when pressed.

### Logs

ip link show

1: lo: ...
2: eth0: ... (no wlan0)

dmesg | grep -i sdio

[ 2.123456] mmc1: new high speed SDIO card at address 0001
[ 2.123789] mmc1: unknown vendor/device (likely MT7668)

evtest (no output when pressing power button)

### Device info

- **Box:** ZTE ZXV10 B860H (regular version, not V5)
- **SoC:** Amlogic S905X
- **RAM:** 2GB
- **Wi-Fi chip:** MediaTek MT7668 (confirmed for this model)
- **Armbian image:** `Armbian_26.05.0_amlogic_s905x-b860h_resolute_6.18.26_server_2026.05.02`
- **Kernel:** `6.18.26-ophub`
- **DTB used:** `meson-gxl-s905x-b860h.dtb` (Ethernet works, USB works)

### Expected behavior

- Wi-Fi interface `wlan0` should appear and work after proper driver/firmware is included.
- Power button should trigger an action (e.g., shutdown or ACPI event) or at least be recognized as an input device.

### Request

Please add support for MT7668 driver/firmware and fix the Power button GPIO mapping for ZTE B860H (S905X) in Armbian builds for amlogic-s9xxx.