HID: add driver for the Logitech Flight System G940

Implements a new USB-HID for Force Feedback based on the normal
Logitech Force Feedback code and FF-Memless.

Currently only supports the FF_CONSTANT effect although the joystick
appears to support additional non-standard ones.

Signed-off-by: Gary Stein <LordCnidarian@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/hid/Makefile b/drivers/hid/Makefile
index f8dc5ba..ce6c8da 100644
--- a/drivers/hid/Makefile
+++ b/drivers/hid/Makefile
@@ -18,6 +18,9 @@
 ifdef CONFIG_LOGIRUMBLEPAD2_FF
 	hid-logitech-objs	+= hid-lg2ff.o
 endif
+ifdef CONFIG_LOGIG940_FF
+	hid-logitech-objs	+= hid-lg3ff.o
+endif
 
 obj-$(CONFIG_HID_3M_PCT)	+= hid-3m-pct.o
 obj-$(CONFIG_HID_A4TECH)	+= hid-a4tech.o