Bluetooth HID: HIDP - don't initialize force feedback

The current implementation of force feedback for HID devices is
USB-transport only and therefore calling hid_ff_init() from hidp code is
not going to work (plus it creates unwanted dependency of hidp on usbhid).
Remove the hid_ff_init() until either the hid-ff is made
transport-independent, or at least support for bluetooth transport is
added.

Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>