arm64: dts: amlogic: meson-s4: fix apb4 bus node name

Fixes the following bindings check error:
apb4@fe000000: $nodename:0: 'apb4@fe000000' does not match '^([a-z][a-z0-9\\-]+-bus|bus|localbus|soc|axi|ahb|apb)(@.+)?$'

Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Link: https://lore.kernel.org/r/20230207-b4-amlogic-bindings-fixups-v2-v1-6-93b7e50286e7@linaro.org


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