Input: apanel - convert to new i2c binding

Convert the apanel driver to the new i2c device driver binding model,
as the legacy model is going away soon. In the new model, the apanel
driver is no longer scanning all the i2c adapters, instead the
relevant bus driver (i2c-i801) is instantiating the device as needed.

One side benefit is that the apanel driver will now load automatically
on all systems where it is needed.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Stephen Hemminger <shemminger@linux-foundation.org>