asus-grouper: bump to mainline + firmware adaptation (!933)

- use mesa-git (until we have functional mesa-grate-git)

Works:
- USB
- WiFi (tested with IWD) + Bluetooth
- Touchscreen
- Phosh rotation (rootston.ini)
- IIO Light sensor
- NFC

Not works:
- 3D
- GPS
- GSM (tilapia)
- Camera

Signed-off-by: David Heidelberg <david@ixit.cz>

[ci:skip-build]: already built successfully in CI