arm64: dts: meson: g12a: add cooling properties

Add missing #colling-cells field for G12A SoC
Add cooling-map for passive and hot trip point

Tested-by: Christian Hewitt <christianshewitt@gmail.com>
Tested-by: Kevin Hilman <khilman@baylibre.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Amit Kucheria <amit.kucheria@linaro.org>
Signed-off-by: Guillaume La Roque <glaroque@baylibre.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>