[SPARC64]: Define ARCH_HAS_READ_CURRENT_TIMER.

This gives more consistent bogomips and delay() semantics,
especially on sun4v.  It gives weird looking values though...

Signed-off-by: David S. Miller <davem@davemloft.net>

include/asm-sparc64/timex.h

@@ -14,4 +14,10 @@
 typedef unsigned long cycles_t;
 #define get_cycles()	tick_ops->get_tick()
 
+#define ARCH_HAS_READ_CURRENT_TIMER	1
+#define read_current_timer(timer_val_p) 	\
+({	*timer_val_p = tick_ops->get_tick();	\
+	0;					\
+})
+
 #endif