ARM: dts: meson8b: Add more L2 (PL310) cache properties

Add more L2 cache properties which are used by the 3.10 vendor kernel
but have not made it upstream yet.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Link: https://lore.kernel.org/r/20230114233455.2005047-3-martin.blumenstingl@googlemail.com


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