Input: move fixp-arith.h to drivers/input

Move fixp-arith.h from drivers/usb/input to drivers/input, as the part of
force feedback support that requires trigonometric functions is being moved
there.

Signed-off-by: Anssi Hannula <anssi.hannula@gmail.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

drivers/usb/input/hid-lgff.c

@@ -37,7 +37,7 @@
 #include <linux/circ_buf.h>
 
 #include "hid.h"
-#include "fixp-arith.h"
+#include "../../input/fixp-arith.h"
 
 
 /* Periodicity of the update */

drivers/usb/input/hid-tmff.c

@@ -36,7 +36,7 @@
 #include <linux/circ_buf.h>
 
 #include "hid.h"
-#include "fixp-arith.h"
+#include "../../input/fixp-arith.h"
 
 /* Usages for thrustmaster devices I know about */
 #define THRUSTMASTER_USAGE_RUMBLE_LR	(HID_UP_GENDESK | 0xbb)