dt-bindings: vendor-prefixes: add Indiedroid

Indiedroid is a sub-brand of Ameridroid for their line of single board
computers.
https://indiedroid.us/



Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230531161220.280744-4-macroalpha82@gmail.com


Signed-off-by: Heiko Stuebner <heiko@sntech.de>