arm64: dts: mediatek: mt8173: Add domain supply for mfg_async

da9211 regulator needs to be enabled before enabling the mfg_async power
domain. Otherwise the subdomain is not enabled and causes failure in
imgtec gpu driver boot.

Add the "domain-supply" property to the "mfg_async" node in DT.

Signed-off-by: Bilal Wasim <Bilal.Wasim@imgtec.com>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Link: https://lore.kernel.org/r/20210701114012.RESEND.3.I9e27871bb700c807a564957302b292e9935dae0b@changeid


Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>