staging: csr: oska: remove refcount.c

It's not called by anyone, so remove it and the .h file and don't export
the functions as they are not around anymore.

Cc: Mikko Virkkilä <mikko.virkkila@bluegiga.com>
Cc: Lauri Hintsala <Lauri.Hintsala@bluegiga.com>
Cc: Riku Mettälä <riku.mettala@bluegiga.com>
Cc: Veli-Pekka Peltola <veli-pekka.peltola@bluegiga.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/csr/oska/Makefile

@@ -2,7 +2,6 @@ obj-$(CONFIG_CSR_WIFI) := csr_oska.o
 
 csr_oska-y := \
        list.o \
-       refcount.o \
        event.o \
        oska_module.o \
        print.o  \

drivers/staging/csr/oska/oska_module.c

@@ -8,14 +8,6 @@
  */
 #include <linux/module.h>
 
-#include "all.h"
-#include "refcount.h"
-
-EXPORT_SYMBOL(os_refcount_init);
-EXPORT_SYMBOL(os_refcount_destroy);
-EXPORT_SYMBOL(os_refcount_get);
-EXPORT_SYMBOL(os_refcount_put);
-
 MODULE_DESCRIPTION("Operating System Kernel Abstraction");
 MODULE_AUTHOR("Cambridge Silicon Radio Ltd.");
 MODULE_LICENSE("GPL and additional rights");