ARM64: dts: meson-gx: Finally move common nodes to GX dtsi

Since we know the GXBB and GXL/GXM share more hardware, we can safely move
the remaining peripheral nodes present in the GXBB dtsi to the common GX dtsi.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>