dt-bindings: vendor-prefixes: Add prefix for InnoComm

This adds a vendor prefix for InnoComm Mobile Technology Corp.,
see https://www.innocomm.com/

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Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>