drm: encoder_slave: use new I2C API

i2c_new_client() is deprecated, use the replacement
i2c_new_client_device(). Also, we have a helper to check if a driver is
bound. Use it to simplify the code. Note that this changes the errno for
a failed device creation from ENOMEM to ENODEV. No callers currently
interpret this errno, though, so we use this condensed error check.

Signed-off-by: Wolfram Sang <[email protected]>
Reviewed-by: Emil Velikov <[email protected]>
Signed-off-by: Emil Velikov <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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