Synaptics: remove useless delay.

As pointed by Axel and explained in Synaptic docs, the touchpad should
delay the first command itself until it's ready, so an arbitrary delay
should not be needed after reset.

Note: I don't have a touchpad on my machine. Please test this :)

src/add-ons/kernel/bus_managers/ps2/ps2_synaptics.cpp

@@ -283,16 +283,16 @@ probe_synaptics(ps2_dev *dev)
 
 	// We reset the device here because it may have been left in a confused
 	// state by a previous probing attempt. Some synaptics touchpads are known
-	// to lockup when we attempt to detect them as IBM trackoints.
+	// to lockup when we attempt to detect them as IBM trackpoints.
 	ps2_reset_mouse(dev);
 
-	// And after resetting we must wait a little for the device to become ready
-	// again...
-	snooze(400000);
-
+	// Request "Identify touchpad"
+	// The touchpad will delay this, until it's ready and calibrated.
 	status = send_touchpad_arg(dev, 0x00);
 	if (status != B_OK)
 		return status;
+
+	// "Status request" (executes "Identify touchpad")
 	status = ps2_dev_command(dev, 0xE9, NULL, 0, val, 3);
 	if (status != B_OK)
 		return status;