sh: Tidy up duplication in irq/swab/timex.h.

The asm-generic versions have some helper definitions that we can use
instead, drop our definitions and use those instead.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/include/asm/timex.h b/arch/sh/include/asm/timex.h
index a873e24..b556d49 100644
--- a/arch/sh/include/asm/timex.h
+++ b/arch/sh/include/asm/timex.h
@@ -8,11 +8,6 @@
 
 #define CLOCK_TICK_RATE		(CONFIG_SH_PCLK_FREQ / 4) /* Underlying HZ */
 
-typedef unsigned long long cycles_t;
-
-static __inline__ cycles_t get_cycles (void)
-{
-	return 0;
-}
+#include <asm-generic/timex.h>
 
 #endif /* __ASM_SH_TIMEX_H */