drm/bridge: tc358767: Increase AUX transfer length limit

According to the datasheet tc358767 can transfer up to 16 bytes via
its AUX channel, so the artificial limit of 8 appears to be too
low. However only up to 15-bytes seem to be actually supported and
trying to use 16-byte transfers results in transfers failing
sporadically (with bogus status in case of I2C transfers), so limit it
to 15.

Signed-off-by: Andrey Smirnov <[email protected]>
Reviewed-by: Andrzej Hajda <[email protected]>
Reviewed-by: Tomi Valkeinen <[email protected]>
Cc: Andrzej Hajda <[email protected]>
Cc: Laurent Pinchart <[email protected]>
Cc: Tomi Valkeinen <[email protected]>
Cc: Andrey Gusakov <[email protected]>
Cc: Philipp Zabel <[email protected]>
Cc: Cory Tusar <[email protected]>
Cc: Chris Healy <[email protected]>
Cc: Lucas Stach <[email protected]>
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Andrzej Hajda <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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