arm64: dts: meson: sort Amlogic dtb Makefile

Sort the Makefile before adding new SM1 devices.

Signed-off-by: Christian Hewitt <christianshewitt@gmail.com>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>
Link: https://lore.kernel.org/r/20210202021021.11068-3-christianshewitt@gmail.com