[SPARC64]: More sensible udelay implementation.

Take a page from the powerpc folks and just calculate the
delay factor directly.

Since frequency scaling chips use a system-tick register,
the value is going to be the same system-wide.

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

include/asm-sparc64/bugs.h

@@ -4,12 +4,7 @@
  */
 #include <asm/sstate.h>
 
-extern unsigned long loops_per_jiffy;
-
 static void __init check_bugs(void)
 {
-#ifndef CONFIG_SMP
-	cpu_data(0).udelay_val = loops_per_jiffy;
-#endif
 	sstate_running();
 }