staging: csr: oska: remove time.h

No one was including it, so remove it.

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/time.h

-/*
- * OSKA Linux implementation -- timing
- *
- * Copyright (C) 2007 Cambridge Silicon Radio Ltd.
- *
- * Refer to LICENSE.txt included with this source code for details on
- * the license terms.
- */
-#ifndef __OSKA_LINUX_TIME_H
-#define __OSKA_LINUX_TIME_H
-
-#include <linux/kernel.h>
-#include <linux/time.h>
-#include <linux/delay.h>
-#include <linux/jiffies.h>
-
-static inline unsigned long os_current_time_ms(void)
-{
-    return jiffies_to_msecs(jiffies);
-}
-
-static inline void os_sleep_ms(unsigned ms)
-{
-    msleep_interruptible(ms);
-}
-
-static inline void os_delay_us(unsigned us)
-{
-    udelay(us);
-}
-
-#define os_time_after(a, b) time_after((a), (b))
-
-#endif /* __OSKA_LINUX_TIME_H */