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Create a separate bus for HDMI related I2C slaves.

Based on work by Wolfram Sang.
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
[wsa: rebased, removed typo in comment, fixed aliases, switched to
named GPIOS, sort SCL pins first]
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>