Activate Elantech toucpad probe but fail.

Now we can see who has Elantech touchpad.
Driver is currently in very bad shape on my hw:
 * mouse jumps
 * mouse clicks maps to wrong button
 * keyboard not working properly when enabled
 * power button only works in force shutdown mode

src/add-ons/kernel/bus_managers/ps2/ps2_dev.cpp

@@ -89,13 +89,11 @@ ps2_dev_detect_pointing(ps2_dev* dev, device_hooks** hooks)
 		goto dev_found;
 	}
 
-#if 0
 	status = probe_elantech(dev);
 	if (status == B_OK) {
 		*hooks = &gElantechDeviceHooks;
 		goto dev_found;
 	}
-#endif
 
 	// reset the mouse for the case that the previous probes leaf the mouse in
 	// a undefined state

src/add-ons/kernel/bus_managers/ps2/ps2_elantech.cpp

@@ -274,12 +274,12 @@ probe_elantech(ps2_dev* dev)
 		return B_ERROR;
 	}
 
-	INFO("Elantech found\n");
+	INFO("Elantech found, under development so no features activated!\n");
 
 	dev->name = kElantechPath[dev->idx];
 	dev->packet_size = PS2_PACKET_ELANTECH;
 
-	return B_OK;
+	return B_ERROR;
 }