Input: drv2667 - fix input device parent assignment

Assigning the I2C bus controller (client->dev.parent) instead of the
I2C client (&client->dev) as the parent device after
devm_input_allocate_device() causes input_register_device() to attach
the devm unregistration action to the parent controller device rather
than the client device. This leaves the input device registered on
driver unbind, leading to use-after-free.

devm_input_allocate_device() already sets input_dev->dev.parent to
&client->dev. Drop the redundant and erroneous assignment.

Fixes: 1c24622572d6 ("Input: add support for the DRV2667 haptic driver")
Assisted-by: LLM
Link: https://patch.msgid.link/20261008094736.918137-3-dmitry.torokhov@gmail.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>