arm64: dts: meson-axg: improve power supplies description

Add the parent supply of the s400 power supplies.
Also add 'regulator-always-on' property on the regulators which can't
be disabled

Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>
1 file changed