dt-bindings: vendor-prefixes: add Source Parts and Lctech names

Source Parts Inc. [1] is a company that makes a series of SBCs, SoMs,
etc under a brand called Popcorn Computer [2].
Shenzen LC Technology [3] makes various boards and related products
around IoT and AI technology. They used the "Cherry Pi" brand name before.

Add both companies' names to the vendor prefixes list.

[1] https://source.parts/
[2] https://popcorncomputer.com/
[3] http://www.chinalctech.com

Signed-off-by: Icenowy Zheng <uwu@icenowy.me>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Link: https://lore.kernel.org/r/20230319212936.26649-4-andre.przywara@arm.com
Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>