dt-bindings: vendor-prefixes: document HTC Corporation

Add the vendor prefix for HTC (https://www.htc.com/

).

Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Luca Weiss <luca@z3ntu.xyz>
Link: https://lore.kernel.org/r/20231125-htc-memul-v3-1-e8f4c5839e23@z3ntu.xyz


Signed-off-by: Bjorn Andersson <andersson@kernel.org>