drivers: core: remove device_link argument from class_compat_[create|remove]_link

After 7e722083 ("i2c: Remove I2C_COMPAT config symbol and related
code") there's no caller left passing a non-null device_link argument.
So remove this argument to simplify the code.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Link: https://lore.kernel.org/r/db49131d-fd79-4f23-93f2-0ab541a345fa@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>