Input: ims-pcu - use driver core to instantiate device attributes

Instead of manually creating driver-specific device attributes
set struct usb_driver->dev_groups pointer to have the driver core
do it.

Link: https://lore.kernel.org/r/20240610041813.722445-1-dmitry.torokhov@gmail.com


Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>