Bluetooth: bcm203x: remove superfluous header files

bcm203x.c hasn't use any macro or function declared in linux/atomic.h.
Thus, these files can be removed from bcm203x.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/bcm203x.c

@@ -9,7 +9,6 @@
 
 #include <linux/module.h>
 
-#include <linux/atomic.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/slab.h>