Input: synaptics - initialize pointer emulation usage

To properly setup event parameters for emulated events, pass
the appropriate flag to the slot initialization function. Also,
all MT-related events should be setup before initialization.

Incidentally, this solves the issue of doubly filtered pointer
events.

Reported-by: Daniel Kurtz <[e-mail]>
Signed-off-by: Henrik Rydberg <[e-mail]>
Signed-off-by: Dmitry Torokhov <[e-mail]>

drivers/input/mouse/synaptics.c

···
 	input_set_abs_params(dev, ABS_PRESSURE, 0, 255, 0, 0);
 
 	if (SYN_CAP_IMAGE_SENSOR(priv->ext_cap_0c)) {
-		input_mt_init_slots(dev, 2, 0);
 		set_abs_position_params(dev, priv, ABS_MT_POSITION_X,
 					ABS_MT_POSITION_Y);
 		/* Image sensors can report per-contact pressure */
 		input_set_abs_params(dev, ABS_MT_PRESSURE, 0, 255, 0, 0);
+		input_mt_init_slots(dev, 2, INPUT_MT_POINTER);
 
 		/* Image sensors can signal 4 and 5 finger clicks */
 		__set_bit(BTN_TOOL_QUADTAP, dev->keybit);