arm64: dts: meson-gx: Switch to the meson-ee-pwrc bindings

The "amlogic,meson-gx-pwrc-vpu" binding only supports the VPU power
domain, while actually there are more power domains behind that set of
registers. Switch to the new bindings so we can add more power domains
as needed.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://lore.kernel.org/r/20200620161211.23685-1-martin.blumenstingl@googlemail.com