HID: hid-multitouch: refactor initialization of ABS_MT_ORIENTATION

The way the input_set_abs_params was called for the new composite field
ABS_MT_ORIENTATION was not very clear at second reading.  We can remove the
non-necessary call to set_abs and use the simple call to input_set_abs_params.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@enac.fr>
Reviewed-by: Stéphane Chatty <chatty@enac.fr>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>