This is a preliminary patch to introduce mt7921s support.
Make init.c reusable between mt7921s and mt7921e
Tested-by: Deren Wu <deren.wu@mediatek.com> Acked-by: Lorenzo Bianconi <lorenzo@kernel.org> Signed-off-by: Sean Wang <sean.wang@mediatek.com> Signed-off-by: Felix Fietkau <nbd@nbd.name>