ARM: dts: meson8b: fix &hwrng node compatible string

There's no documentation for a "amlogic,meson8b-rng" compatible string.
Keep the default compatible string from meson.dtsi which is
"amlogic,meson-rng" (which is also documented).

This fixes a binding check error.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20240218111959.1811676-4-martin.blumenstingl@googlemail.com


Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>