ARM64: dts: meson-gx: move the SCPI and SRAM nodes to meson-gx

SCPI and SRAM are identical on GXBB and GXL. Moving the corresponding
nodes to meson-gx adds support for the thermal sensor on GXL based
devices.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Tested-by: Neil Armstrong <narmstrong@baylibre.com>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
[khilman: add scpi_clocks label]
Signed-off-by: Kevin Hilman <khilman@baylibre.com>