Bluetooth: ath3k: remove superfluous header files

ath3k.c hasn't use any macro or function declared in linux/device.h.
Thus, these files can be removed from ath3k.c safely without
affecting the compilation of the ./drivers/bluetooth module

Signed-off-by: Mianhan Liu <liumh1@shanghaitech.edu.cn>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

drivers/bluetooth/ath3k.c

@@ -10,7 +10,6 @@
 #include <linux/slab.h>
 #include <linux/types.h>
 #include <linux/errno.h>
-#include <linux/device.h>
 #include <linux/firmware.h>
 #include <linux/usb.h>
 #include <asm/unaligned.h>