misc: bh1780: Add module aliases

The bh1780gli driver does not create an i2c module alias for the
device it supports, preventing the driver from being loaded
automatically when needed on non-OF/DT systems. Add it.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>